If you plan on trick-or-treating, avoid houses like these.

This compilation of haunted houses from classic horror films will give you chills, cause you to hide under a pile of blankets and make you seriously consider keeping all your lights on.

There are more than three dozen movies here, some classic (Psycho, Poltergeist and The Exorcist), some obscure (The Babadook, Ils and The House of the Devil) and all terrifying.

Seriously, after watching this we are never climbing up another set of stairs again unless there's a small army accompanying us. That, or it's time to start scouring the real estate listings looking for ranch style houses so we don't have to worry about stairs.

Happy Halloween, everybody!