One of the most iconic images in the history of the comic book industry is that of Captain America slapping a right-hook across Adolf Hitler's grill on the cover of Captain America Comics #1, the character’s first appearance. And during the USO musical number from Captain America: The First Avenger, Steve Rogers is shown giving an actor playing Hitler the very same punch, much to the delight of the troops. It’s a shame that Hitler wasn’t an actual character in the film; we would've loved to see a full-scale beatdown of the Führer, Inglourious Basterds style.