If you thought Abraham Lincoln fighting vampires was tame, then watching Franklin Roosevelt fight werewolves in FDR: American Badass! might be more your speed. Spoilers ahead (not that it matters).
As every US schoolchild knows FDR contracted polio from a werewolf bite in 1931. (Yes, you read that right.) It turns out it wasn't just any upstate New York werewolf though. It was a Nazi werewolf. Because the Axis are werewolves.
Hitler, Hirohito and Mussolini on a conference call
If you're using more than one brain cell to follow the plot you're doing it wrong. The movie doesn't take itself seriously and neither should you. It's mindless irreverent entertainment and knows it. It's best watched with plenty of the intoxicant of your choice.
Here's the red band trailer. (NSFW due to language)