10 Horror Movie Tropes That Prove "If It Ain't Broke, Don't Fix It"
10. The Monster Under The Bed
This trope involves a very real, if not necessarily physical presence that well and truly frightens most of the film's characters. The monster in question will often make itself known by scratching windows, creaking the floorboards and so on. It will also be the film's antagonist.
In other words, the monster under the bed is the entity in a horror film that at least one of the characters might dismiss as being a childhood nightmare that nobody over the age of 7 should believe in. Like the Boogeyman, for instance. This character will undoubtedly be proved very wrong by the end of the film.
Trope Examples: Freddy Krueger - A Nightmare on Elm Street (1984), The Creeper - Jeepers Creepers (2001), Michael Myers (often compared to the Boogeyman) - Halloween (1978) and Bughuul Sinister (2012)