10 Horror Movies That Cleverly START With Huge Twists

What Keeps You Alive is centered around a married couple, Jackie (Hannah Emily Anderson) and Jules (Brittany Allen), who celebrate their first wedding anniversary at a remote cabin - ever a solid setup for a horror movie, right?

Jules soon learns some unsettling information about Jackie's past relating to the death of a childhood friend, but the couple eventually appear to resolve this issue.

However, mere moments later, as Jules stands on the edge of a cliff, Jackie shoves her off, apparently killing her and seemingly confirming her involvement in her aforementioned friend's death.

But wait, there's more - Jules actually survived the fall, and now has vengeful designs on her duplicitous wife.

Now, this all occurs just 25 minutes into the movie, providing one hell of a setup for the remainder. If you weren't gripped by that absolutely thrilling, unexpected first act, were you even really watching?