Ernie and Bert forever, man.
Especially eating cookies in bed. And "here fishy fishy". And teaching the pigeon to play checkers. And Bert with the pot on his head.
Actually, my very favourite is probably their rhyming game.
"I don't want to play a game with rhymes."
"Nice goin', Bert, I'll ring my chimes."
"I don't want to do it!"
"There's really nothin' to it!"
"It's so silly."
"A boy named Billy!"
"Stop it. Please."
"The dog has fleas!"
"Oh!"
"Mow!"
"Ernie..."
"Bernie!"
And so forth.
-Sidebottom