I recently moved house and decided to install a wireless burglar alarm. I plumped for the Visonic Powermax Pro - excellent piece of kit by the way. I had it installed in less than two hours with 30 minutes of that time spent connecting it to the mains via a fused spur. Anyway, my girlfriend Val and I were going for a night out and Val was stood near the front door with her arm on the door handle as I pressed the Arm away button on the keyfob. The panel announced 'Arming Away - please exit now'. Val immediately dropped her arm and turned to me and said 'How did it know that'.
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True story, honest.