What is the difference between a 16 ounce brick and a carpenter?

1. One weighs a pound and the other pounds away
2. About 230 pounds, and one I.Q. point.
3. Carpenters work with wood and they are HUMAN BEINGS. Bricks (16-ounce bricks to be specific) are NOT HUMAN BEINGS.

It's a joke so #1 above is the answer.