I took a piss next to Tommy Lasorda at Dodgertown in Vero Beach, Florida one year during spring training.
Had my picture taken with Cliff Robertson.
Got within 10’ of Harry Chapin after a show.
I saw Maya Angelou have a drink at the place where my sister tended bar.
My folks met Pope John Paul II when he was a mere cardinal
My sister talked with Stefan Pastis.
My cousin met Bobby Vinton.
Supposedly, my husband’s family includes one of Dean Martin’s ex-wives and Jerry West, of NBA fame.
We don’t move in very famous circles. Plus most of the folks on my list are dead…
Saw Paul Keating (ex Australian PM) in the QVB (upscale shopping mall) one time. He was wearing dark glasses and a really nice suit.
I knew both Dave Chappelle and Patton Oswalt pretty well when they were starting out and also used to hang out with Sarah Silverman when she came to DC. I also met Louis CK when he was starting out. I’m still friends with someone who stays in touch with everyone.
These are people I’ve actually met:
Isaac Asimov
Leonard Bernstein
Ernest Borgnine
Michael Feinstein
Jose Feliciano
Allen Ginsburg
Alan Greenspan
Joel Grey
Keith Hering
Sir Edmund Hillary
Janis Ian
Larry Kramer
“Cubby” O’Brien (original Mouseketeer/drummer)
Luciano Pavarotti
Bernadette Peters
Ayn Rand
Vito Russo
Stephen Sondheim
Frank Spangenburg (longtime ‘90s Jeopardy! champion)
Micky Spillane
Barbra Streisand
Garry Trudeau
Back in the 1920s, when my mom was about 13, she was a winner of an art competition, and won a trip in a biplane, plus her picture taken with Orville Wright (half of the Wright Brothers). The kid who would become my father was the other winner, but his mom wouldn’t let him go.
I saw John Edwards in the deli/produce section of my local grocery after his affair with Rielle Hunter had been revealed and his wife had kicked him out. The first thing that came to my mind was that he was touching the food, and I knew where those hands had been. Ew. 
Ha! 
I got some battered paperbacks signed by Spider Robinson, when he came to a used bookstore in East Lansing, Michigan.
Seen some scifi celebs. George Takei was really cool, and paid a lot of attention to the fans at the table when several of us won a drawing to have dinner with him. Same thing next year with James Doohan, except he was half drunk and didn’t seem to care about the fans.
My father sold a bag of sandwiches to Larry Fine of the Three Stooges. Their bus had stopped at a West Virginia restaurant when they had a traveling review in the early 1960s.
I attended a meeting with Steve Jobs in the early 1990s. My office had bought a whole bunch of NeXT machines, and he stopped by to discuss their features with programmers.
I saw Jamie Foxx do standup at a small comedy club in DC. He was still obscure enough that the newspaper ad subtitled his name, “Ugly girl on ‘In Living Color’”. My date and I were the only white people in the first few rows, and Foxx greeted us and deadpanned that it was good to see more of us getting out, in the wake of the recent LA riots.
Got Ted Williams’ autograph during intermission at a cinerama movie in Boston way back when (he was still playing).
Was on an airplane returning to NY from Puerto Rico with the whole of Sha Na Na in early 70s.
Was manning the register in the men’s dept. when Jackie O was shopping at Saks Fifth Ave for a jacket for John-John’s 21st birthday.
Shook Bill’s and Al’s hands when they were campaigning in '92 in Madison, WI.
Passed Steve Martin on the street in NYC in '80s. Someone was yelling at him and he was pissed off. Ahh, NYC…
.
Define seen. As in been in the same room?
Barack obama, Bill Clinton, several senators and authors.
I’ve spoke to Mike Pence before (he was a rep from my state once, and i talked to him about the Iraq war).
Other than that, not many people.
As for OP, you probably saw one of Saddam Hussein’s body doubles. He likely wouldn’t just enter a hotel without a massive amount of security beforehand.
I’ve had conversations, or at least exchanged words with:
Al Gore (I’ve met him twice)
Jane Goodall (I took her on a tour of the Biomuseo in Panama, where I was curator)
Frank Gehry (I worked with him on the Biomuseo, which he designed)
Christopher Reeve (I lived in the same dorm as him as an undergraduate)
Jared Diamond
Paul Ehrlich (I took him birding in Panama)
Michael Collins (Apollo 11 astronaut; I had breakfast with him in 1979)
Omar Moreno (baseball player; I went on a birding trip with him)
Ruben Blades (actor and salsa musician)
E.O. Wilson (biologist and Pulitzer Prize winner; I had dinner with him)
Aaron Copeland (I had dinner with him)
Mariel Hemingway (I had lunch with her)
Al Kooper
Panamanian President Nicholas Barletta
Celebrities I’ve shaken hands with:
Peter Matthiessen
John Lindsay
Richard Leakey
Panamanian Presidents Ernesto Perez Balladares, Martin Torrijos, and Ricardo Martinelli, and Vice-President Ricardo Arias Calderon
Ones I’ve been within 10 feet of:
Ted Turner and Jane Fonda
The Dalai Lama
Rigoberta Menchu (Nobel Peace Prize winner)
Bo Diddley
Michael Bloomberg
Panamanian Presidents Mireya Moscoso and Juan Carlos Varela
People I’ve seen give lectures:
Stephen Jay Gould
Carl Sagan
Hans Bethe (Nobel Physics Prize winner)
Louis Leakey
Margaret Mead
Alan Ginsberg
William S. Burroughs
Gary Snyder
Gregory Corso
Ken Kesey
William Shatner
I’m not listing performers I’ve seen in concert or on stage, or baseball players I’ve seen play or at Old Timers Games.
During WWII, my father was on the USS Eldorado, the flagship at Iwo Jima and Okinawa. He would have seen most of the top brass of the Pacific War.
I don’t know how this happened, but I ended up right next to Jackie at a museum in DC many decades ago.
I met Greg LeMond a couple times. Friend of a friend.
Saw Jennifer Aniston backstage after a Broadway play (my wife’s friend did the makeup).
Met award-winning children’s author\illustrator Ted Lewin when he gave a talk to a group of librarians at Brooklyn Public.
I see “free money” guy Matthew Lesko at Whole Foods occasionally.
Ditto former Detroit Piston Adrian Dantly.
Billie Jean King and Olympic gymnast Dominique Dawes visited the school where I work a few years ago.
Fugazi drummer Brendan Canty had kids at another school where I worked.
Pro wrestlers Raven and Molly Holly read to kids at in another library where I worked.
During college I was a server at a dinner where Arthur Schlesinger spoke. I got to ask him a question.
Many years later, my then 10 year old son got to ask George Will a question at a Washington Nationals fanfest Q&A
I met author Nora Roberts somewhere or another (my mother-in-law knows her).
Oh, I forgot some. My creative writing teacher was a minor science fiction author (Sheila Finch) and she knew just about everybody in the field. She would have famous authors come to talk to us about how to write. We had Larry Niven, David Brin, and Octavia Butler come to talk to us. She invited the whole class to her house for a Christmas party, and Harry Turtledove was there.
Endless politicians.
The Clintons.
The Gores
GHWB and Barbara
Gerald Ford (I was very young)
Too many Senators and Congressmen to count
Jeanne Kirkpatrick (she said she liked my work)(and she gave me a cookie…hand baked!)
Ted Strickland (former Governor of Ohio)
Rich Cordray (for Attorney General of Ohio and D candidate for governor this year)
Athletes
Ryne Sandberg
Gregg Zaun
Frank Robinson
Brooks Robinson
Darryl Green
Scottie Pippen (in line at Pecos Bills at Disney World)
Entertainers
Joan Jett
Taylor Swift (at age 19)
Stan Lee
Dave Sim
Steven Colbert
Vin Diesel
Gene Simmons
Joey Ramone (he bummed a quarter off me)
Steve Cropper (played on stage with him)
Chuck Berry
Terry Moore
Frank Cho
Sergio Aragones
Will Eisner
Newsies
Helen Thomas
Tom Brokaw
Christiane Amanpour
Miscellaneous
Lord British (Richard Garriott)
Sid Meier
John Carmack
Katherine Graham
Ed Zotti
Others that will doubtless come to mind the second I hit the ‘post’ button. Most of them professionally. Occasionally personally or some other means.
My parents met Ford at an event to mark the 75th anniversary of the law school. And more recently my mother met Padma Lakshmi at a private party. I think I saw Andy Grove outside a restaurant in San Francisco.
At last count, I’ve seen 79 members of the Baseball Hall of Fame. Probably a dozen or so more, pitchers I saw on the field but who didn’t play that day. Got personal autograph from one, Enos Slaughter.
Shook hands with Queen Elizabeth II, Prince Philip, Pierre Trudeau. Saw the queen a second time, and waved, but she didn’t act like she recognized me.
Worked backstage with Ray Charles, Dionne Warwick, Dick Clark.
My mother played as a child with Les Paul, whose uncle lived next door to her.
My ex saw Muhammed Ali at an airport and got his autograph.
I remembered two more.
Thomas Schaefer was the ranking military officer among the hostages held in Tehran. My dad knew him before he got the diplomatic posting to Iran; they might have even been in the same squadron. He must have liked the area, because after he was released he moved back and lived on my paper route. Of course I never asked him about it, but he gave a talk at my high school. Interesting stuff.
I met Randall Munroe, the creator of xkcd at a friend’s birthday party a few years ago. Even played Cards Against Humanity with him. Didn’t know it was him until after he left, though.
Multiple Spanish actors; many of Barcelona’s most famous singers and musicians, just walking down the street. There’s a bar in Plaça Catalunya where I’ve seen many famous musicians enjoying the sight of their fans seeing them 
and Prince once came to a concert I was attending (by mistake, I suspect; either he didn’t know that famous club happened to be hosting an RB concert or someone mistook Rockabilly and Rythm’n’Blues). Back home, I went to class with a guy who’s now a movie director, another who became a professional musician, got a couple world-famous cousins…
One time during a company dinner at a fancy restaurant, someone remarked on how a guy looked a lot like Javier Bardem. “Naaaah, what would he be doing here?” Eat, I guess? Specially since the blonde lady he was with happened to look a lot like Pilar Bardem, Javier’s mother 