It was a very hot day. Two men were digging a ditch.
One said to the other, “Our boss is up there in the shade of a tree. Why are we down here digging a ditch?”
“I don’t know,” replied the other. “I’ll go ask him.”
He climbed out of the ditch. He went to his boss.
“Why are we digging in the hot sun and you’re resting in the shade?”
“Intelligence,” the boss said.
“What’s intelligence?” asked the digger.
The boss said, “I’ll show you. I’ll put my hand on this tree. Hit it with your fist as hard as you can.”
The ditch digger made a fist. He swung as hard as he could and tried to hit the boss’ hand. The boss removed his hand and the ditch digger’s fist hit the tree.
The boss said, “I just demonstrated intelligence!”
The ditch digger went back to his hole. His friend asked, “What’d he say?”
“He said we’re down here because of intelligence.”
“What’s intelligence?” his friend asked.
“I’ll show you.”
The ditch digger put his hand on his face. He said, “Take your shovel and smash it into my hand.”