Two blondes are building a house. The first blonde is nailing nails into 2x4's. She'd pull a nail out of her bag, but would only nail it in if it was facing the right direction. Otherwise, she'd throw it behind her back. The second blonde comes over to see her wasting nails. ""What do you think you're doing?!"" she asked. ""These nails aren't facing the right way."" the first replied. ""You idiot! Those are for the OTHER sides of the house!""