I felt that it needed to be done...
This year I have a flatmate who has no idea what the term 'volume' means...

He puts his music (rap, hip hop, etc) on at stupid times at full volume. I've asked him to keep it down, but he just ignores me. So now, whenever he puts his music on, I deafen myself by using my PC to play Metallica at full volume.
He's either going to keep his volume down or attack me soon. I'm not sure which...