My friend (age 15-16) used to imagine himself as tech-savvy and would constantly talk about planning his future PC, considering the best parts, overclocking his groaning GPU to play Witcher 2 at 10 FPS instead of 5. He played through the whole thing multiple times, mind you, it did not stop him. One time he gave me his old 4GB RAM and an HDD drive as a gift. I plugged the HDD in alongside the one I already had (mind you I had a crappy 2000s PC, friend guided me on what went where) and the computer started to lag like crazy. Yeah, we did it while the computer was running, expecting a new hard drive to pop up on the UI. So that idea went nowhere, it was swiftly detached. Then, knowing it was an operation requiring a turned off PC, we plugged in the RAM into an empty slot I had. Launching the computer, a spark happens, I smell something in the motherboard, saw smoke and immediately crouch down to see nothing happening. Computer won't budge, had to send it to service.
Computer worked fine since then, but my friend felt incredibly sorry. Still kept trying to gift or even sell me his old computer parts. I did not accept a gift from him ever since. And about his big plans for a future PC? He bought a prebuilt one and was scared to open the case because the service dude told him not to. What a guy, I swear lol