This weekend, in the spirit of Halloween, I plan to run a one shot (well, probably two shot before it's over with) of the Onyx Path game They Came From Beyond the Grave! It's part of their series of They Came From games, each made to sort of emulate some cinematic genre from 50s to monster movies, to Italian Sword and Sandals pictures, to (in this case) 60-70s horror films of the Hammer, Amicus, or AIP variety.
All these games use the Storypath system which is basically a descendant of the old White Wolf d10 dice pool system, but lighter and with some mildly narrative mechanics, like Rewrites which players can use to change the results of bad rolls or get a bit of narrative control. One of the things Rewrites can be spent on (though this is an optional rule) are Cinematic Powers which imbue the game world with the elements of the low budget films it's emulating. For instance, there's Dangerous Liaison wherein a player can pay for an awkwardly inserted scene (utterly free of danger!) to romance an NPC.
Players have other, less game-reality bending extras to employ like Tropes, Trademarks, and Quips that lend bonuses in specific situations. In fact, if I have any criticism, it's that the system is perhaps a little overstuffed with options for an otherwise "at the light end of rules medium" game.
Anyway, I plan to run to run Cthulhu Dreadfuls Presents #1 - Kiss of Blood, which is a very Hammer Horror flavored scenario. It seems easy enough to adapt.