A young chap is walking down the street when he hears a girl's voice coming from the direction of the gutter. When he looks down he sees a frog.
The frog looks up at him and says "Good sir, I am a beautiful princess who has been trapped in the body of a frog by a wicked witch. If a young man kisses me I will turn back into a princess. If you kiss me and release me from my curse I'll do anything you desire."
The young chap considers this, picks the frog up and puts it in his pocket.
"Please help me!" says the frog. "Kiss me and I will do anything your heart desires. I will be yours until the end of time!" The young man takes the frog out of his pocket and says "I'm afraid I'm a computer programmer so I haven't got time for a girlfriend, but a talking frog - now, that's cool."