10 Worst Horror Movie Decisions With Unbelievable Consequences

Leaving your EpiPen at home can certainly have unfortunate consequences if you're unlucky enough to suffer an allergic reaction. For one, you're probably taking a trip to the hospital.

But you surely wouldn't expect that such an everyday act of forgetfulness would cause your decapitation and kickstart a chain of events that result in your brother becoming possessed by the demon king that's been laying dormant within you all along? No?

That's the completely insane outcome in Hereditary, when poor Charlie Graham (Millie Shapiro) leaves her EpiPen at home and then goes to a party with her brother Peter (Alex Wolff).

Charlie accidentally eats a cake containing nuts and goes into anaphylactic shock, forcing her stoned brother to uneasily drive her to the hospital.

But of course, as Charlie gasps for air while leaned out of the car window, Peter swerves to avoid a dead deer, causing Charlie to be decapitated by a telephone pole.

The rest of the movie sees a traumatised Peter becoming increasingly psychologically broken, such that demon Paimon - who was previously residing within Charlie - is eventually able to take control of his body by film's end.

While it's fair to assume that Paimon's coven would've simply contrived another circumstance to kill Charlie if this one somehow failed, the fact that such an horrific series of events - also including the brutal deaths of Charlie and Peter's parents - was set in motion by Charlie leaving her EpiPen at home is... unexpected to say the least.