Fortune-Teller and the Frog
A fortune-teller gazes into crystal ball and says to a frog: "You are going to meet a beautiful young woman. From the moment she sets eyes on you, she will have an insatiable desire to know all about you. She will be compelled to get close to you - you'll fascinate her."
The frog said, "Really? That's great! Where am I? At a singles club?"
The fortune-teller answered, "Biology class."