The man picks up the frog, puts it in his pocket, and walks on down the street. A little later the frog calls out from the pocket and says, "Hello? You must not have understood what I said.  If you kiss me, I'll turn into a beautiful princess and I'll marry you."

The engineer takes the frog out of his pocket, looks into its eyes, and says,"Look, I'm a computer guy.  I don't have time for a relationship.  But it's really cool to have a talking frog."