madman

If there were a way to ensure that train travelers wouldn’t become the victims of the murderous rampage of a madman like Mr. Ferguson, somebody would have come up with it by now.

One could never tell when a chain-saw-wielding madman was about to jump out from behind a wall.

Zemeckis, who co-wrote the screenplay with Bob Gale, must have been as much of a madman savant as Christopher Lloyd’s Doc Brown to compress so much plot into every frame.

His defence lawyer described the attack as the "deed of a madman" at the start of the proceedings.

Matters turn, ahem, even graver when a guard from a nearby lunatic asylum arrives to announce a madman has escaped.