slightly unrelated ...
... but along similar lines. A long time ago, before I got into publishing and IT, I worked in a Hi-Fi equipment shop. A guy had just bought a large and rather expensive Hi-Fi (record deck, radio, tape deck). A little while later he rang to say that it wasn't working and, as he lived locally, could he bring it back. I said OK. A little while later I saw his car pull up outside, and then he got the large Hi-Fi unit out of his car, and struggled into the shop with it, and then went back to get the speakers (which were equally big and heavy). Anyway, I soon saw the cause of the problem – when he'd got home and started to assemble the unit he'd looked at the plugs on the end of the speaker leads and thought they were "for American power outlets" so he'd cut 'em off and fitted 13 amp mains plugs to 'em before plugging the speakers into the mains!