Sure this is a 2nd grade joke, but that was a good year

Author: ObiJo

Date: April 5, 2001

by ObiJo
4-05-01
I heard a knock knock joke today, but you have to start it.
OK. Knock Knock.
Who's there?
Ummm...welllll...HOW THE HELL SHOULD I KNOW?!?
HaHaHa.