Actually, have you seen Anti Joke[/url]? It takes classic joke setups but drops the punchline for a literal answer. Here are a few examples:
What’s worse than finding a worm in your apple? The Holocaust.
Why did the boy drop his ice cream? Because he was hit by a bus.
What’s sad about four black people in a Cadillac going over a cliff? They were my friends.
Your mother’s so fat, she should probably be worried about the increased risk of cardiovascular disease.
Also has some pretty good ‘Roses are red…’ gags:
Roses are red,
Violets are blue.
I have a gun.
Get in the van.
Roses are red,
Violets are blue,
I have Alzheimer’s.
Cheese on toast.