A friend of mine got a new watch that could be programmed to serve as a remote control. So we went to a bar one night and he programmed it to take over the TVs above the bar. Around closing time one of the bouncers was directed to turn off the TVs. So he did so, then my friend, with a couple subtle presses of a button on his watch, turned them all back on.
The manager yells at the bouncer, telling him to turn off the TVs. The bouncer does so again, my friend turns them back on. Eventually the bouncer was frustrated, but still clueless, so he unplugged the TVs.