Knock (5:09)
Dread Central; Facebook (Crypt TV); Halloween Short Films; Horrors of Halloween; IMDb; Vimeo

This 2014 short film was presented by Crypt TV in 2017.

This is one I found on facebook. On Halloween night, a young woman named Murielle accepted a dare from some friends, based on a local legend. There's this abandoned mine where a witch is supposedly buried, or whatever. The dare is to knock on the mine's door three times, saying the witch's name. After doing this, Murielle hears something that terrifies her, so she runs back home to hide. Soon, her roommate (or sister?) Emma returns home, and tries to convince her there's nothing to fear, it's all just a silly prank. Of course, that turns out not to be true. I totally saw the twist ending coming the whole time, but it was still pretty creepy.