Three statisticians went hunting. When they arrived at the forest three deer stepped out in a line directly across from the three statisticians. The statistician on the right fired and hit his deer, then the statistician on the left fired and hit his deer. At that point the statistician in the middle said, "Well boys we all got our deer, lets go home!"
*OK! This one may take a while to even elicit a smile. In fact, it took me over a day to realize what was funny here. Just think about basic analytic geometry and the "a ha" will hit you. Bruce Hunn sent me this clever story from the Army Research Laboratory in Ft Huachuca, AZ. Many Thanks!