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.
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.)