And also, there is this Ernie & Bert sketch, probably from the 1st season, in The Sesame Street Story Book. I am assuming that it was on the show, but I'm not sure, here it is:
"BERT Presents The Number 5"
(We see Ernie sleeping in a chair, as Bert walks into the room.)
B: Wake up, Ernie. You're supposed to learn something.
E: I did learn something. I learned that you won't let me take a nap.
B: (holds up number 5) Don't be funny. What's this I'm holding up?
E: Uh...a banana cream pie?
B: NO, you meatball! Guess again.
E: I know! It's a CHOCOLATE cream pie!
B: (holds up chocolate cream pie in his other hand) Look, birdbrain. If this number 5 is a chocolate cream pie, then what's this in my other hand?
E: It's a number 5.
(Bert throws pie, and it dumps on Ernie's head)
E: I knew what it really was...but who wants to get hit with a number 5? Yum.
Maybe it would be better if they edited out the part with Bert throwing the pie. Anyway, was this ever on the show?