A Lucky Goldstar TV/video combo. Saw it in the window, on the way back from a liquid lunch at my local, never heard of Lucky Goldstar but it looked exactly like a Sony unit I'd been sort of thinking about, but at £149.99, something like a hundred quid less. I lurched in and quizzed the young Asian guy behind the counter who confirmed that it was indeed a shameless copy, made by this Korean mob who were muscling into the market on price, with gear that was actually rocksolid. Wobbled back to my shared-house room with it in a big cardboard box - the first of many addresses, since it worked flawlessly for something like 15 years. LG now, of course.
PS Thinking about it, it wasn't actually accidental - I did make a conscious decision to buy it. But I was very drunk - does that help?