Remain Calm

When a stranger comes up with an uncanny smile and tells you to remain calm, you know something weird is up, because that's about the worst thing a stranger can say. But then he says he's from the federal government, and that's even scarier. The twist in this story is that remaining calm is the only thing that will save your life. How can you do that when you're terrified? Or when you're watching a creepy horror story? Well, what normally calms you down when you're stressed? You don't need to answer that; the film will guide you. 

Remain Calm is a horror short by Jake Lewis of the Lewis Brothers, starring Pauly Shore, Nick Swardson, and Doug Jones. Yes, it does have some comedy overtones among the terrifying scenes that have commenters asking for more episodes starring the two store cashiers, or a full-length movie, or even a series following these characters. (via Metafilter)