Watching Blake Lively fight off a shark in her new movie is the stuff of nightmares.

Look away now if you’re one of two people: Someone who loves the version of Blake Lively circa 2005 and Sisterhood of the Travelling Pants, and someone who hates sharks.

Because your image of Lively as a sweet, blonde soccer-playing teenager may mildly disturbed by a trailer of her new film, The Shallows.

In the trailer, Lively is fending for herself against a rather menacing looking shark. And the whole thing looks terrifying.

Think a cross between Jaws and Blue Crush and there you’ll find this movie sits somewhere comfortably in between.

Handy hint: mute the sound and you’re left with some scenic ocean shots of Lively swimming with a shark. Maybe you’d prefer that…?