A computer geek is crossing the road when he sees a frog who opens its mouth and starts talking.

"If you kiss me," the frog says, "I'll turn into a beautiful princess, stay with you for a week, and do anything you want".

The guy smiles and puts the frog in his pocket.

"Did you hear me?" asked the frog. "A beautiful princess? For a week?"

"Look," says the nerd. "I haven't got time for a girlfriend. But a talking frog- now, that's cool."

-from Readers Digest

That joke lands in such a great place in my head. I love it.