Or when a tech in the UK removes the shrink-wrap from a replacement PSU freshly-shipped from the US (yes, I'm that old, basic parts were still sometimes manufactured there at the time) and installs it into the PC without checking the voltage switch is set to 240V. (And yes, it wasn't a nominal 230V at the time either.)
Poor guy was the first tech on site after the workplace had negotiated new kit from a large US-based vendor, with full hardware support. Previously we'd done "return to base" for the really gnarly faults in equipment supplied by the previous UK-based manufacturer. It probably didn't help there were at least four of us standing around observing the new support arrangement in operation.
To give us credit, none of us laughed out loud at the loud BANG! and resultant billow of Magic Smoke. I think one of us gently suggested the voltage switch as the probable root cause while he looked on in shock. Motherboard, CPU and memory plus PSU were duly replaced with no further excitement a day later, ISTR.
Biting the hand that feeds IT
