I know a person in school who has two amusing t-shirts.

One of them says:

"I have just kidnapped myself. Pay me $1000 or you will never see me again."

And the other one says:

(On the front) "How do you keep an idiot busy? Turn to the back of the t-shirt."
(On the back) "How do you keep an idiot busy? Turn to the front of the t-shirt."

I don't have pictures of them though.