Tom Lehrer
Stan Freberg
Beyond the Fringe/Peter Cook,Dudley Moore (which left me wide open for Monty Python)
1960s Second City
I have a friend who can take the most mundane everyday things and make a hilarious story, just by her attitude and storytelling. That’s what I like about Seinfeld–stupid little things we all see but up there being told by someone funnier than me.
So, definitely Seinfeld for me, and MST3K. And David Letterman back in the day for the self-deprecating but actually kind of arrogant thing. And his giggle.
Rocky and Bullwinkle
Bennett Cerf’s Book of Laughs
Get Smart!
Roger Ramjet
The Three Stooges
Bob Newhart
Oddly, Creem magazine, which was a music monthly, probably influenced or mirrored my humor more than anything else.
Other than that, the usual suspects: Mad magazine, Airplane!, Looney Tunes, and later Seinfeld.
Oh, and Andy Kaufman - I always cracked up at his shit while my friends and family were scratching their heads.
Chronologically:
Rocky & Bullwinkle
Mad magazine
Bill Cosby LPs
National Lampoon
Mel Brooks movies
Monty Python
The Groove Tube
Saturday Night Live (1975-79)
Tom Robbins novels
Hitchhiker’s Guide to the Galaxy
Discworld
MST3K
Christopher Moore novels
There were other influences, of course. But those are the ones I can return to and still enjoy to this day.
My holy trinity of Funny British Authors:
Terry Pratchett
Tom Holt
Douglas Adams
Also, Dave Barry.
Firesign Theater
I used to watch TV with my dad when I was young and so the following influenced me:
Not the Nine O’clock News
Drop the Dead Donkey
Monty Python
Blackadder
The Young Ones
Bottom
Dad’s Army
Fawlty Towers
Open All Hours
I developed a love for sarcasm, irony and satire. I love clever wordplay and witty put-downs.
Apart form those I think Red Dwarf was the most influential to me. I still love it today.
My mother prefered sitcoms like The Good Life, Butterflies, Bread, 2.4 Children
All That
The Simpsons
Garfield
SNL
Leno
In addition to many mentioned here, The Far Side was a huge influence during my formative years.
In order of influence:
- Mad Magazine (70’s, 80’s)
- Letterman (80’s)
- MASH
- Coen Brothers Movies
- SNL (70’s)
- Eddie Murphy (80’s)
- George Carlin (70’s)
- Monty Python Movies/TV
- Robin Williams (70’s)
- Some parts of some Wes Anderson Movies
I use the Three Stooges as a dating barometer. If a woman can at least crack a genuine smile watching them then we have some potential together. Unscientific study; Women who like the Three Stooges = sexual tigress in the sack. 
Also:
Airplane!
The Naked Gun
Blazing Saddles
Young Frankenstein
My family, and my family’s tendency toward depression are probably the main contributors of the morbid and sarcastic slants to my humor. It’s a really obvious coping technique. I’ve had to force myself to cut back on both in the last couple of decades because surprisesurprise not too many people think sarcasm and morbidity is very funny. Though I do still love a good dead baby joke. In company with my family, we can let loose… and as my family ages, gatherings tend to be funerals quite a bit, which practically encourages the humor to flow more.
Reading Peanuts faithfully and extensively as a child probably contributed to the sarcasm, as well as the self-deprecating part of my humor.
For my absurd sense of humor… God, there are so many influences. Monty Python (and imported British shows in general), Ren & Stimpy, Mad Magazine, old prank tapes, SNL skits, the RE/Search book Pranks!. Even now, things like the Ventrilo Harassment video series, 4chan and somethingawful.com, Little Britain, and other influences feed and sustain it.
Along the way, Henry Rollins’ spoken word bits have seeped into my brain… I find when relating humorous stories to people that I tend to mimic him a lot.
No one’s going to admit to You Can’t Do That On Television!? Ok, then I will. Other 1980s Nickelodeon shows that shaped my sense of humor include Turkey Television (which among other things endlessly repeated Dana Carvey’s “Chopping Broccoli” bit) and Out of Control, with “Uncle Joey” before he became “Uncle Joey”.
Later in life I found Monty Python. I’ll never forget how hard I laughed the first time I saw Holy Grail. In high school, I brought in a Python Hollywood Bowl video to my speech class (for a “visual aid” or something). I thought it’d be a hit, but 80% of the class didn’t find it funny or refused to admit that they found it funny. Jerks!
[ul]
[li]Bill Cosby’s comedy albums (Mom bought every single album he released)[/li][li]The Hitchhiker’s Guide to the Galaxy[/li][li]Monty Python’s Flying Circus[/li][li]A Night at the Opera and other Marx Bros. movies for their slapstick and physical comedy.[/li]1960s BC comic collections for visual gags.[/ul]
I was more interested in watching Moose.
Bill Cosby Albums
Dr. Demento
George Carlin
Cheech & Chong
Rocky & Bullwinkle
Tom Lehrer
Allen Sherman
Little Rascals
W.C. Fields
Laurel & Hardy
The Marx Brothers
The Three Stooges
Edgar Bergan & Charlie McCarthy
Stan Freberg
Fritz the Cat
The Fabulous Furry Freak Brothers
Hans Conreid (Fractured Flickers)
All in the Family
I tend to prefer situational comedy, immature humor, black comedy, and dry or geeky humor. I even like bad puns. I don’t like purely slapstick or overly mean comedy like the three stooges, and I generally don’t like stand up comedians, although if forced to watch one I manage to enjoy myself.
Probably the biggest influences:
- The dry, clever, geeky humor of Douglas Adams, Monty Python, Big Bang Theory etc.
- The sophomoric humor of teen & gross out comedies - American Pie, HIMYM.
- The black humor of my father’s side of the family - Death at a Funeral, 9 Dead Gay Guys, Killer Condom
I was a big fan of the show, and enjoyed it for it’s general entertainment value, but I didn’t find it actually all the funny, at least not laughing out loud funny.
Calvin & Hobbes
Simpsons
MST3K
It’s likely not about your idea of humor being so different, but more about Seinfeldian humor having been done to death.