.. with hammers, Ann and Susie were doing some carpenter work on a Habitat for Humanity house.
Ann, 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.
Susie, figuring this was worth looking into, asked, "Why are you throwing those nails away?"
Ann 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."
Susie got very upset and yelled, "You! moron! Those nails aren't defective! They're for the other side of the house.