Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: Bruce Lee
While most of his films have been considered awesome, if not comic, there have been moments in them that made him look scary. For example in Fist of Fury/Chinese Connection, when Chen (Bruce) found out who murdered his teacher, he killed the first man with one blow to the stomach and pummel tortured the second man to death. To make it even more scary, he strung up their corpses onto a lampost outside Jing Wu School.