Not IT, but many years ago, back when I was in school, I had a part time job in a coffee bar. One day the customers started complaining that the jukebox had stopped working. I walked up to it and held my hand, palm vertical, above the front panel. I moved my hand slowly to the left and then to the right and when I got back to the centre did a light 'karate' chop on the panel. The machine suddenly burst into life and the customers gave a great cheer as I pretended to be nonchalant while I walked back behind the counter.
I got the sack a while later, but that might have been to do with the other incident of balancing about 30 glasses stacked one inside the other.
p.s. thanks for the articles Simon and good luck!