He is a 'madman' out on the ski slopes. [=he is an extremely daring or reckless skier]
He drives 'like a madman'. [=he drives very recklessly]
a celebrity being stalked by a 'madman'
(..) The choice between doin' ten years... and takin' out some stupid motherfucker... ain't no choice at all. But I ain't no madman, either. What the fuck was Joe thinkin'? You can't work with a guy like that. We're awful goddamn lucky he didn't tag us when he shot the place up. I came this close (..)1992 Reservoir Dogs
(..) Mr. Blonde started shootin' everybody. - Soon as I heard the alarm, I saw cops. - It wasn't that soon. They didn't let their presence be known until after Mr. Blonde became a madman. I'm not sayin' they weren't there. I'm sayin' they were there. But they didn't make a move until after (..)1992 Reservoir Dogs