Warning: This Creepy Ronald McDonald Makeup Tutorial Is Not For the Faint of Heart

We all have nightmares down here, and the one you're bound to have tonight comes courtesy of this YouTuber's creepy clown makeup tutorial that's basically a really frightening cross between beloved McDonald's mascot Ronald McDonald and It's Pennywise.

The tutorial was made by Ellinor Rosander, who also created that mesmerizing Buffy the Vampire Slayer look. In her new upload, the special-effects makeup artist gives a very in-depth demonstration on how she managed to make her clown transformation happen. She starts off by splattering some blood on a Ronald McDonald costume off camera before giving a step-by-step lesson on how to use plastic, hot glue, and liquid latex to re-create Pennywise's terrifying, toothy smile. The end result is pretty nightmare-inducing, but it's also pretty hard to look away from. Watch the full tutorial above at your own risk.