16 Signs To Tell If Your Housemate Is A Serial Killer

11. They Have An Excellent Memory

They will be able to tell you everything that you said in one particular conservation on June 20th 2006. They have the uncanny ability to remember everything that has ever happened in their life and yours to the point where, even though you're pretty sure they weren't even there, they can tell you every tiny detail of a night out. How they remember what you were wearing for your 16th birthday, when you didn't even meet them until the final year of University, isn't even worth thinking about. You obviously just forgotten that you had told them before, or showed them childhood pictures. That's the only logical explanation, right?