Just curious what was the first computer you ever owned and what was your biggest mistake you made with it that you look back and laugh at?

Well Ill tell you mine.. back in like 1995 I got my first computer and scraped it and put it back together and I put the 586 AMD 120+ Chip back in backwards it was funny I fried the chip etc.. Luckily I had another chip waiting JIC ROFL.. It was in all a funny scenario. We all make mistakes damnit.. now tell me about yours.