Holds hand up in shame
Back in the days of big clunky 286 PCs; it was sometimes necessary to power off and back on again between using certain software. Someone asked if they could use my PC and I said "OK, but turn it off and on again first." Big mistake. I should have said "Turn it off, wait a few seconds, then turn it back on again." She turned the computer off and immediately back on again, causing a surge that burned out the power supply unit. Sigh.