So, I’ve known about this guy who looks like Jack Nicholsonfor years now. We both attend some of the same events, and I always give him a discrete nod.
He goes out of his way to nurture the look; he keeps his sunglasses on even after sundown and he’ll avoid having his pic taken. Know any lookalikes?
How about me? I’ve been asked several times if I’m Colin Mochrie (from Whose Line Is It Anyway?)
The son of a co-worker was the spitting image of Howard Stern. Until co-worker made son get a haircut.
After haircut, he looked more like Daniel Stern. 
I have been mistaken for Dr. Demento more than once.
I knew a woman who looked just like Irene Cara of Fame fame.
as a kid my dentist looked like Joe Namath when he was in the NFL (so it was long ago)
My dental hygienist looks like Cheryl Hines.
One of my closest friends used to be a dead ringer for Dave Matthews, until he got fat. I mean, my friend got fat, not Dave Matthews. Although if Dave Matthews also got fat, maybe they look alike again.
Mine was a Jack Nicholson clone as well. We used to work together in retail and at least once every few days some customer would do the whole “OMG you look just like…” routine.
When Chris Elliot was first gaining attention for his appearances on David Letterman’s show, I looked almost exactly like him. I would hear, “Hey, It’s the guy under the seats!” whenever I was out in public. I even signed a few autographs for people who wouldn’t take no for an answer.
Over the years, we’ve both changed in different ways, so it doesn’t happen anymore. We could probably pass for brothers though.
A friend of mine was often mistaken for Christopher Reeve, but not so much after 1995.
I’ve got a buddy who looks kind of like Sean Penn. Not dead ringer territory, but enough that he gets asked about once or twice a year.
I know a guy who looks quite a bit like Mike Ditka and he’s worked on the look to get it down – he’s got the mustache, glasses, and Bears sweater and everything. He does paid events and things as a lookalike but I’ve also seen him show up at church events, unpaid, and just happening to look exactly like a Mike Ditka lookalike.
I have a very good friend from NYC. First time I met him I thought George Costanza had walked in the door.
Ha! Just this past month, I ran into a guy that looked just like Mike Ditka. I even said, “Pleasure to meet you, Coach!” He started laughing and said that he gets it all the time.
When my hair was thicker I was mistaken for Henry Rollins a lot. Sometimes I had to bare my arms to show that I have no tattoos to convince people that I wasn’t him. I would catch people staring at me in bars. My guess was that people thought it wasn’t totally unlikely that they would see Rollins in a bar (especially the sort of bars I would go to), but as far as I know he doesn’t drink.
A friend looked like Sandra Bullock when they were both in their early 30s. Their respective looks have changed enough in the meantime that she’s no longer mistaken for her, which is good because it always upset her when people pointed it out. I never minded being mistaken for Henry Rollins. It was fun.
FtGKid2 is a ringer for an actor that was sort of well known a few years back. (But whose career is fizzling now.) The actor for a while was dating one of the most famous actresses in the world for a short while. So I used to point out to the kid what his dating pool could be.
Of the couple dozen or so folks I regularly play music with, one looks just like Buck Owens, while another resembles Eric Clapton.
The barista in my local Starbucks looks exactly like Emma Watson during her bangs phase.
Some years back, Liam Neeson had his face on a magazine cover, and everyone said “That’s Tony!!!” He looked exactly like a coworker.
Unfortunately, Tony hasn’t aged as well as Liam.
