Two boys go on a visit to the zoo.

After wandering around looking at all the different animals, they finally make their way to the gorilla exhibit. One boy looks to the other, says "Watch this," and sticks his fingers in his ears and looks at the gorilla. To his friend's astonishment, the gorilla copies him. He then opens his eyes wide and flares his nostrils. Again, the gorilla copies him. Amazed, his friend turns to the gorilla and sticks out his tongue.

The gorilla goes apeshit. It bursts out of the cage, grabs the boy, and violently slams him into the pavement before placidly returning to its cage. As the boy is rushed to the hospital, his friend asks the zookeeper what caused the gorilla to attack.

"Well, he stuck out his tongue," replied the zookeeper. "That's like flipping someone off in gorilla language."

Months later, after being discharged from the hospital, the boy decided he wanted revenge. He went home, got his baby brother's soft toy hammer and a real hammer, and broke into the zoo. He returned to the now-repaired gorilla exhibit and found the same gorilla.

The boy stuck his fingers in his ears and looked at the gorilla. The gorilla copied him. The boy bulged out his eyes and flared his nostrils. The gorilla did the same. Smiling, the boy tossed the hammer into the cage. He then pulled out the soft toy hammer and hit himself in the head with it. The gorilla paused, looked at the hammer, looked at the boy, and stuck out its tongue.