There were two blondes with hammers, Becky and Sally Ann, doing some carpentry work on a house. Becky, who was nailing down house siding would reach into her nail pouch, pull out a nail and either toss it over her shoulder or nail it in.
Sally Ann, figuring this was worth looking into asked, “Why are you throwing those nails away?”
Becky explained, “When I pull a nail out of my pouch about half of them have the head on the wrong end and I throw them away.”
Sally Ann got completely upset and yelled, “You moron!!! Those nails aren’t defective, they’re for the other side of the house.”