Two rookie roofers are up roofing a home.  The first rookie pulls out a nail and then hammers it into the roof. Then he pulls out another nail, looks at it, then throws it over his shoulder. Rookie #2 eventually saw what Rookie #1 was doing, watched him a while and then said, “Why do you keep throwing out every other nail?” Rookie #1 replied, “Because their points are on the wrong end.” Rookie #2 then said, “You airhead, those nails are for the other side of the roof!”

 

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