Crazy Person
Everybody knows somebody who is untidy or a bit of a pedantic neat freak. This creates a clash of personality but it’s not a big deal in the grand scheme of things. However, there are extremely crazy people out there and they make the worst roommates imaginable.

One Redditor described their toxic living situation: “He freaked out and threatened multiple people, saying he would hack their computers and destroy their lives. Eventually, someone told him his iPad was in one of my friend’s rooms. He went inside, grabbed the guy, put a knife to his throat, and asked him where the iPad was.”