An engineer was crossing the road one day, when a frog called out to him and said, "If you kiss me I'll turn back into a beautiful princess." He bent over, picked up the frog and put it in his pocket. The frog spoke up again and said "If you kiss me I'll turn back into a beautiful princess and stay with you for a week."

The engineer took the frog out of his pocket, smiled at it and returned it to his pocket. The frog then cried out, "If you kiss me I'll turn back into a beautiful princess and stay with you for a week."

Again the engineer took the frog out of his pocket, smiled at it and returned it to his pocket.

Finally the frog asked, "What's the matter? I've told you I'm a beautiful princess and that I'll stay with you for a week. Why won't you kiss me?"

The engineer said, "Look, I'm an engineer. I don't have time for a girlfriend, but a talking frog, now that's cool!"