Did You Hear About The Construction Worker Who Was Hired To Frame A House?

The guy was taking nails out of his bag and hammering them in to the frame, and the foreman was watching him. Every so often the worker would take a nail out of the bag, look at it, and throw it away.

After a while the foreman comes over and asks why he is throwing away perfectly good nails. He replies, "Some of them have the head on the wrong end."

The foreman takes a deep breath and says, "You idiot! Those are for the other side of the house!"