This was the best hack when I was 11. My computer had a too small fan that was always on max speed, and thus really loud. To overcome this issue I wrapped a thick blanket around the entire computer case. A week later it broke down due to the obvious heating problem, and when it came back from service the repair technician just looked at me saying "Someone has had this computer fucked up intentionally, everything is melted from within. What have you done to it?!" Me being the piece of shit that I was just denied and got a brand new PC for free, nobody ever knew..