A Bend, Oregon, policeman had a perfect spot to watch for speeders, but wasn't getting any.  Then he discovered the problem:  a 12-year old boy was standing up the road with a handpainted sign which read "Radar Trap Ahead".  The officer also found the boy had an accomplice who was down the road with a sign reading "TIPS" and a bucket full of mone.  (And we used to just sell lemonade!)