A couple of years ago I built a AMD mini-ITX system which needed a low profile CPU cooler. I bought one and installed it, only I used the incorrect bracket or spacers or something (I don't know exactly), and when I installed the cooler it bowed the motherboard badly, something I didn't notice until later when I took apart the build because it was acting so wonky. That was also a brand new AM4 mobo I'd bought just a month prior. I had an AMD Ryzen 7 5700G in it. I tried that board outside of the case, but it was dead. I also killed the Ryzen 7 5700G in the process. FML.
About a year prior to that, I was removing an AMD Ryzen 7 5800X from a mobo, and the CPU slipped out of my grasp, and fell on the floor. It landed on edge, and badly bent most of the pins in one row where it hit. I have terrible vision, my hands aren't steady, and I don't have any proper tools or experience trying to work on stuff like that, so I had no choice but to throw it out. FML.
Many years ago I had bought a brand new Abit motherboard, and was installing that type of CPU cooler that had the clips that you had to press into place with a screwdriver. Remember those? The screwdriver slipped, and it flew across the mobo, taking out at least one or two traces on the board. FML.
I'm a real life Dennis The Menace!