Interesting.

On Seinfeld, everybody was funny except Jerry.  On All in the Family, nobody was funny except Archie (until George came in the picture.) The Big Bang Theory is odd because EVERYBODY, including the extended cast (ie Howard's mom/Blossom/comic book store guy), is really really funny, but if wasn't for Sheldon I'd never watch a second of it.  Interesting.  Also interesting: I once almost single-handedly won the greatest basketball game of all time.

Sheldon: When do you evacuate your bowels?
Leonard: When I have to.
Sheldon: When you have to? I'm sorry, I don't rent to hippies.