386s had a push button power switch where if you were really fast you could let it out and immediately push it back in and the power wouldn't be interrupted. Found this out in class - we would walk over to each other, lean over pretending to talk to a friend and sneakily push the power button in. Before we worked out that trick, you would have to get your finger on the button before the other guy took his off, then hold it down while you saved your work.