This found footage movie starts with a cool premise about secret government experimentation on American citizens and somehow wastes it entirely on trying to startle the viewer with countless jump scares.

This shouldn't really be called a "found footage" movie either because it's impossible to decipher the camera's placement. Sometimes the main character is talking into it and there's also occasions when it's following her around in a low resolution, shaky cam fashion. And there are other times when it appears that the camera represents her personal point of view. It was aggravating.

But "Banshee Chapter" mostly wants to startle you. There are no lasting scares, only those of the jump scare variety. The entire movie exists to surprise you. To make you jump out of your seat and spill your popcorn, cat-leaping-out-of-the-closet style. "Banshee Chapter" exists for no reason other than to leap out at you and shout "BOO"!!!