Alan and Ray building a shed
Alan and Ray were building a shed at Wallan and they were nailing the floorboards and Alan picks up a bag of nails and looks at the nails and started to nail away when he notices the head of the nail was at the wrong end of the nail so he tossed it away.. he did this with many of them as he took them from the bag and saw them with the heads at the wrong end.
"Why are you doing that"? asks Ray "Because the heads of the nail are on the wrong end" replied Alan.
"Stupid man", says Ray, who prided himself as being a bit smarter than Alan,"Don't throw them away,, Keep them for the ceiling."