A Boy and his Frog
A boy was crossing a road one day when a frog called out to him and said, "If you kiss me, I'll turn into a beautiful princess." He bent over, picked it up and put it in his pocket.
The frog spoke up again and said, "If you kiss me and turn me back into a beautiful princess, I will stay with you for one week." The boy took the frog out of his pocket, smiled at it, and put it back into his pocket.
Then the frog cried out, "If you kiss me and turn me into a beautiful princess, I'll stay with you and do ANYTHING you want." Again, the boy took the frog out, smiled at it, and put it back into his pocket."
Finally, the frog asked, "What is the matter?! I've told you I'm a beautiful princess, I'll stay with you for a week, and I'll do anything you want. Why won't you kiss me?"
The boy looked at the frog and said, "Look, I'm an engineer. I don't have time for a girlfriend, but a talking frog is cool."