Drug Abuser
Drug users make some of the worst roommates if their habit develops into something darker. One Redditor revealed how their roomie went off their rails after a night of hard partying. This led to violence and law enforcement became involved in an escalating situation.

One night he takes loads of cocaine/ecstasy (resting heart rate of 155bpm),” GregorF92 wrote. “He beats up his boyfriend in the flat, and the boyfriend runs away bleeding and phones the police, I have to speak to the police at 1 am and don’t get to sleep until about 3:30 am, before being up for work at 4:45.