Have you ever replaced memory in a computer so poorly that it billowed smoke?
(Fun fact: I did this with a super computer I was repairing at a customer site. I failed to push the memory in all the way, so it went in at an angle. Shorted the board out. It was like a smoke machine at a concert! Customer puffed on his pipe [you could smoke in the office back then!], said "Huh! Well, guess I'll see you in the morning!" and left me to my overnight, full midplane and memory replacement.)