It's a while ago - but I got a call to a classroom as someone's laptop had gone off , just shut down on them yet it's on charge... I let them rant for a while then turned to the wall and flicked the switch turning the power on to the charger. (which was under the white board infront of the whole class to see)
I left with out saying anything.
I had a phone call, which stated, "MY COMPUTER IS DEAD, I NEED IT THIS LESSON, THE KEYBOARD AND MOUSE AREN'T WORKING, HELP!!!!" My response, "Have you pressed the power button?" the answer I received to that question was "Ah, that's fixed it." Some people.... xD