"Why does our boss get to stand in the shade while we dig?"
"I'll ask him."
The man climbed out of the hole. "Why are we digging in the hot sun and you're in the shade?"
"Intelligence."
"What do you mean?"
"I'll show you," the boss said, putting his hand on the tree. "Hit my hand with your fist as hard as you can."
The boss moved his hand and the man hit the tree.
Back in the hole, the man repeated, "Intelligence."
"Huh?"
Putting his hand on his face, he said, "Hit my hand with your shovel really hard."