16 Signs To Tell If Your Housemate Is A Serial Killer

12. They'll Skulk In The Shadows

Usually when you invite a few people round with the intention of throwing a traditional 'let us see who throws up first' house party, your housemate will become withdrawn and not really speak to many people, if at all. They'll also probably stay in the darkest part of the room and instead of joining in, will sit and people watch, observing with either an emotionless expression or a slight, creepy smile hinting on their lips. It's only when you realise that they've disappeared to a dark corner of the flat with someone you only introduced them to an hour ago that you start to get worried.