12 Movies Based On Real Life Serial Killers

Though not nearly as frightening as IT, Gacy is a film with its own killer clown that may make you shudder.

More accurately, the man of which it's based on will give you nightmares. A well-respected Chicago native, Gacy raped and killed young men, burying many of them on his property. He was fond of dressing up as Pogo the Clown, which dubbed him the moniker the Killer Clown.

Unfortunately, the film Gacy is far from scary. Most critics encourage you to steer clear of this movie and watch a documentary instead. With a Rotten Tomatoes audience score of 21%, the film does nothing to explore Gacy's motives beyond the fact that he was abused as as child.

While the film does have a few unsettling moments, it's definitely a made-for-TV movie that doesn't fall high on a must-watch list.