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.
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  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.
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  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.
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  The husband then suggests that the wife lift her dress up above the
  thighs… this drives the gorilla absolutely crazy.
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  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.”