Just found a link on waxy to a website with jokes that have real endings. Very silly stuff, here are some examples:

How do you drown a blonde?
Hold her head underwater until she can no longer breathe and stops struggling.

Why did the blonde get fired from the M&M factory?
Repeated absences and stealing.

What’s the difference between the Pope and Michael Jackson?
The Pope is dead.

Why do Mexicans not like going out in the rain?
It’s wet.

What’s worse then finding a worm in your apple?
The Holocaust.

Why was six afraid of seven?
It wasn’t. Numbers are not sentient and thus incapable of feeling fear.

More jokes here.