Why Eddie Haskell is the way he is; was the way he was:
Eddie Haskell : When I was a little kid in kindergarten, we had a woman taking care of me, and she sent me to school with a home permanent.
Wally Cleaver : Boy, Eddie. What happened?
Eddie Haskell : Well, I told my father about it and he made a great big joke. You know somethin'? I don't think I've ever really told him anything since then.
Wally Cleaver : Gee, Eddie, then how come you're always jumpin' on other guys, and makin' fun of them?
Eddie Haskell : Look, Sam,... if you can make the other guy feel like a goon first, then you don't feel like so much of a goon.
Wally Cleaver : Ahhh, I don't get that.
Eddie Haskell : Of course you don't. That's 'cause you never went to kindergarten with a home permanent.