Taking nursery rhymes, and making them for "adults..."

...only to realize that you're more immature than ever.

Yes, I've heard most of 'em, and they still crack me up.

Eg:


SIMPLE SIMON met a Pie man going to the fair.
Said Simple Simon to the Pie man,
"What have you got there?"
Said the Pie man unto Simon,
"Pies, you dumbass!"

An oldie, but a goodie.
(Hat tip to Guy K.)