It’s a beautiful warm spring day and a man and his wife are at the
  zoo. She’s wearing a cute, loose-fitting, pink spring dress,
  sleeveless w/straps. As they walk through the ape exhibit and pass in
  front of a very large gorilla, the gorilla goes ape. He jumps up on
  the bars, holding on w/one hand (and 2 feet), grunting and pounding
  his chest w/the free hand. He is obviously excited at the pretty lady
  in the sheer dress.
  
  The husband, noticing the excitement, suggests that his wife tease the
  poor fellow. He tells her to pucker her lips, wiggle her bottom, and
  flirt w/the ape.
  
  She does and the gorilla gets even more excited, making noises that
  would wake the dead. Then the husband suggests that she let one of her
  straps fall; she does, and the gorilla is so excited, he’s just about
  to tear the bars down.
  
  The husband then suggests that the wife lift her dress up above the
  thighs… this drives the gorilla absolutely crazy.
  
  Then, quickly the husband grabs his wife by the hair, rips open the
  door to the cage, slings her in w/the gorilla and says, “Now, tell him
  you have a headache.”