Biting Elbows' Bad Motherfucker.

The protagonist is relentlessly hunted by a squad of black-suited mercenaries across buildings, rooftops, snowy mountains, and a decommissioned airplane, all while trying to recover a strange device. The short film went viral, racking up over 150 million views online, and inspired the 2015 full-length first-person action feature film, Hardcore Henry.