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'
(..) But now I have a new chance. Can I have the ticket back? We have one little... hiccup. - What do you mean? - Benedict has the ticket. The madman with the glass eye? - How are you getting back? - Good question. But I would not want to nit-pick, right, Danny? Just follow my lead. (..)1993 Last Action Hero