This 'V/H/S: Viral' Clip Just Might Make You Jump (Exclusive — and NSFW)

The above video is for mature audiences (with strong stomachs). Imagine yourself skateboarding the u-shaped slopes of an empty Los Angeles river channel — and suddenly noticing a scary staring down at you. Watch above for the gory jack-in-the-box jolt that happens next during the final sequence of V/H/S: Viral, the third anthology of the shaky-cam horror shorts, available on demand today and in theaters Nov. 21.