A guy goes to the zoo to feed the monkeys. He throws the monkey a peanut and the monkey picks it up, sticks it up his rear end, pulls it out, and eats it.

The guy sees this and is immediately disgusted.

He throws the monkey another peanut and when the monkey picks it up, he sticks it up his rear end again, pulls it out, and eats it.

The guy says to the zookeeper, "Man, that is one very stupid monkey!"

"No, that's one very SMART monkey. Last week, someone threw him a big peach and he ate it and he couldn't pass the pit so now he measures everything."