Completely Insane

He's gone completely insane...

This is "soft" speak used to describe someone who's insane or shares many aspects with the former. Like with Bonus Points, Get Your Mind Out Of The Gutter, and No Shit, we didn't originally make this phrase. This is usually used to speak of the Lunatic, but it can also be used for someone who is figuratively insane.

Roles who are Screwed In The Head are the Perv, Mad Scientist, and Psycho. Although the Mad Scientist may not show his insanity all too much and is called "mad" because insanity is an Extreme Extremity, the role is still related to insanity.