We won’t only be listing horror movies here, but we simply have to pay a passing nod to Paranormal Activity. This movie was made for one reason and one reason alone – to make you as paranoid as possible and as jumpy as hell.  Suffice to say, these are exactly the kinds of things that do not bode well with copious marijuana consumption. And for the love of all that’s holy, don’t even think about challenging yourself to watch it alone while high.