There's not many movies that manages to successfully combine horror, humor, and sex all in one movie. An American Werewolf In London not only manages to do all three, but does it in this brilliant way that defies expectations.
Directed by John Landis while at the height of his powers, the humor and the gore contrast each other in this brilliant way that nobody has done before, or since. The attraction between David Naughten and Jenny Agutter seems as real as it gets. The special effects make you really believe Naughten turns into a wolf.
All the actors give outstanding performances, and Landis's attention to detail, and subtle in-jokes add to the story immensely.
Must see horror.