In Allentown, Pennsylvania, a 19 year-old man who apparently really dug Underworld had convinced himself and the 16 year old girl who had sex with him that he was a werewolf (and also part vampire). For proof, he demonstrated his canine teeth to police officers who then pointed out that canine teeth don't necessarily make him a creature of the night, and even if everyone else on the planet didn't have teeth like his, he still wouldn't be a werewolf, because they are fictional. He did show all the common signs of being an asshole, though, so there's that.
In Fond Du Lac, a 39 year-old man was arrested after breaking into a woman's house and claiming he too was a werewolf, indicating that the common theme amongst those who think they're lycanthropes is that they're also piss poor criminals.
In the world of normal folks, the disease called hypertrichosis is also known as werewolf syndrome, because boring Latin names will never be able to stand up to the mildly insulting pop culture names we can think up for diseases. It's characterized by the growth of thick hair over the entire body including the face. Sadly, few of the people who suffer from it have ever ripped a man to shreds under a full moon, though several took up work in the Mexican circus which we hear is almost as bloody.