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."