One boring day in the grey and brown surroundings of my secondary education a fake hand appeared. We decided to try it out on one of the brothers (Jesuit in training) and placed it on his chair. He came into the room and did not sit down. He did not look in the direction of his desk or chair for 20 minutes. The tension was electric. When he eventually looked down and saw the hand/part of bloody arm (not particularly well rendered - standard joke-shop fayre) his face went a dead off-white and he squealed "Eeee! What have you little bastards done!" - we were all simultaneously stunned and delighted, expressing it in the only way we knew how... Whooping, hollering and laughing. When our mentor realised what was going on he turned a shade of red which, to my sincere regret, I have not seen anywhere since.