This is a comedy short for a fake movie called Hell No: The Sensible Horror Film, and it's basically a horror movie in which all of the characters make all of the smart, right decisions when faced with an intense situation. It seems like it would be a very anti-climatic film, but it sure is a funny trailer.
Imagine a realm where the most horrifying terrors of the underworld emerge to wreak bloody vengeance upon any who… hmm? what’s that? you wanna go literally anywhere else? yeah, good idea let’s get out of here