3. Super Hans Peep Show
One of the obvious black marks against any potential housemate should be a crack addiction. Even if it's one that seems to come and go like Super Hans' does. Thanks to Super Hans' toxic influence on his friends being so considerable, unless you can work up the courage to explicitly tell him to get stuffed, you'll end up living in squalor and the aftermath of numerous drugs parties that, as Hans himself puts it, "Go beyond fun and start to get really really nasty". All thanks to his overall philosophy basically being "Drugs are good". Plus he's not above having sex in your bed, trying to have you sectioned if it works in his favour, and taking acid at important events. So if you absolutely must live with him, don't take him to a funeral, always lock your bedroom door, and try to section him as a pre-emptive strike.