Before they make the hit, these gangsters shoot the sh!t

Two assassins-for-hire have an hour to kill (so to speak) before their next hit. To help pass the time, they entertain themselves by regaling horror stories to one another. With bizarre titles such as "Valkyrie's Bunker" "Assacre" and "Hog Hunters" - which hit-man's story will be deemed most disturbing when all is said and done?