My girlfriend designed this simple Lego NXT robot to startle people who came up to our doorstep. The bot uses an ultrasonic sensor (attached to the box and hidden in spider webs) to determine when someone has stepped in front of our newspaper box. It then turns on the light sensor's red LED for dramatic effect and then thrusts a large spider (attached to the bot by a chopstick) out towards the visitor. Approximately 2 out of 3 trick-or-treaters were caught off guard.
Here is a video of it in action: http://www.youtube.com/user/ph0015d4y#p/a/u/0/8ITSmziMPSs
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