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'
(..) Clouseau, the famous detective, was decorated by General Wadafi. Then, he went back to France where I believe he took over the position... vacated by the madman Dreyfus. There it is, ladies and gentlemen. The largest diamond in the world. And surely the most famous, (..)1975 The Return of the Pink Panther