I think comedian Patton Oswalt is pretty damn funny. I never really watched King of Queens, but i've always liked his stand-up and his bit parts when he was getting his start on Reno 911.
Anyway, Oswalt was a recurring character on KoQ, and as the story goes, they had him in this bit "birthday party" scene, but they gave him no lines and nothing to do, so he decided to just fuck around and see if he could get away with doing, well, literally NOTHING for the entire scene.
And NOTHING is exactly what he did. He didn't talk. He didnt move. He didn't blink. Hell, I'm not even sure if he was breathing, but watching this clip makes me laugh and creeps me out at the same time.
I just find it extremely funny that no one paid enough attention to notice what he was doing and to not let this go out on TV as the final cut.