Dumbass Miner

There were two miners were working in a mine. On top there is an office.

Miner A asks Miner B: Why do we have to work in these dirty mines while those guys up there sit in an fully air-conditioned office in their fancy chairs and expensive computers.
Miner B: Because they are smarter than us.
Miner A: What do you mean?
Miner B: Here let me show you
Miner B puts his hand on a rock and says : hit my hand as hard as you can.
Miner B moves his hand as Miner A punches, Miner A hits the bare hard rock and recoils in pain.
Miner B: Do you see now?

Miner A goes home to his wife and says: Honey, i know why i work in the mines while other guys work in offices
Wife: Why?
Miner A puts his hand on his face and says: hit my hand as hard as you can.