Help, I think my housemate is insane!

[Substitute Troll]

Wow. Obviously you should demand that he moves out immediately. If he doesn't, get the police or something involved. Shouldn't be a problem though, if both you and your friend agree, he has no say in the matter. That lunatic shouldn't be living with people.

 

[renegade7]

Definitely has some anger control issues.

Unless he's become a really close friend or something, don't bother keeping him around. If he makes you feel as uncomfortable as you indicate, it's time to find a new roommate.

It's his own fault he can't keep a lid on it. And even if it is related to some sort of psychiatric issue, there is no reason you should have to compromise your comfort for him. Take it from someone who gave a horrific roommate far too many chances and ended up paying the price.