When I was in the Navy, we would send a newbie Seaman to the tool room for a left hand stiltson (Pipe Wrench). When they arrived with it in hand, we told them it was a right hand and to go back to the tool room and get the correct one. When they handed it back to the Tool Room Seaman, he flipped it over and gave it back to him. Some of them realized they had been pranked and some had no idea.