[TOMT][video] A stand up or performance art with the performer just repeating the same phrase over and over again

I think it goes something like this (probably wildly inaccurate, but I think you get the overall idea): There's a famous chick in the background, and the guy says what he's going to do and that people will laugh, then stop laugh around the 5th time, but whne they get to the 10th time or so they start laughing again in desperation because it never ends. and he just keeps shouting something like "Katie is riding her bike is riding her bike" or something weird like that, while the girl in the background is dancing around in circles.

Solved. I got it from radiolab originally: https://www.youtube.com/watch?v=-g7Az9o6cpo