I have had many an accident with my machines. Here is a sampling, in chronological order:
I can't tell you how many times I returned my C64 to Target after having blown up one of its CIAs. I probably contributed to Commodore's demise thanks to Target's liberal return/replacement policy. Oh, and to add to my shame, the CIAs were blown due to my attaching home-made hardware to the user port, and not a fault of the C64 itself.
I lost my favorite monitor by transporting it in mid-winter and turning it on immediately. Took me years to find a (mostly) better replacement.
I was running out of space on my old hard drive, and got a newer, bigger one. When I issued the command to format it, I typo'd and formatted my running main partition, instead. These days, it would be harder to do that. Took me over a month to recover all the data by examining all the data blocks. Good thing I was out of space, as I had compressed nearly everything on the drive (using an auto-compressing file system), and the compressor kept the old file name, length, and checksum. Also a good thing I had a blank drive to use as an OS and storage for recovered files.
I finally reverse-engineered a vibrating game pad so I could have it vibrating in Linux, as well. As I was putting it together again, I crossed some wires, and it smoked the next time I made it vibrate. As with any such devices, they were no longer sold and all that work was for nothing.
I didn't keep my "machine room" clean enough, which probably resulted in one of my AlphaStation's CPUs' fan clogging and dying. The burned CPU board was spectacular. However, I was able to pull the board and continue running the machine until I got a replacement. By coincidence, the replacement/upgrade machine I bought also had a non-functional second CPU (soldered to the main board, so not possible for me to replace due to lack of solder flow equipment), but this time due to lying, cheating sellers rather than my own fault. Oh well. Alpha is good and dead now, so I guess I don't miss 'em, much.
While wiping my work laptop as I was leaving my last real job, I dropped it and accidentally damaged the optical drive, which was its defining feature (compared to the Mac Air).
I was trying to get a Windows 10 tablet to become a Linux tablet. Sound didn't work. I tried fiddling with the BIOS settings, and ended up bricking it. Bricked it will remain, as I have no intention of letting store "experts" play with the private data I had already transferred to the device. In fact, I have bricked many a cheap tablet due to non-use/battery death, and will probably never buy another.