in home room last year me and my freind found this motion senser that went of wenever you walked in front of it..so we taped a label to the side that said gaydar, and then taped it under the teachers desk wen he left the room,then wen he came back and sat at his desk it went off...he found it taped under his desk and read it out loud the hole class started laughing at him..lol he was mad