Prior to the ATX standard, many will recall that AT motherboards received power from two separate connectors, fitting adjacent to each other onto a single row of pins on the board. Unfortunately, it was possible (and common) to connect these incorrectly, thereby trashing the MB along with the components connected to it.
Someone who had done just this, asked me if I knew of any place that had a 'motherboard repair service'. In these situations one endeavours to keep a straight face, so I thought for a moment then replied: 'Actually all computer dealers provide this service; you just give them the spec of the equipment you've destroyed, and they'll cheerfully sell you replacements.'
There are some looks one never forgets.