Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: Arachnophobia
There are two versions of the poster for the film - one with a small spider dangling in front of a full moon, seen on the main article, and one without the spider (as seen here). The reason for the latter version is that the former freaked people out with it's subtlety. Well done!
The Video Game
The game over screen for the game adaptation. A picture is displayed of your character where he's basically been overrun by spiders, and has webs in his nose. It's pretty freaky as a kid.