Question about a werewolf movie/show

[SnowWalker]

Alrighty then, maybe one of you pack members can help me out:

I slightly remember back in the day watching a werewolf movie (or maybe it was in a tv show) and it had something to do with a person being a werewolf (duh) and it was the full moon and they changed (duh) and they thought they were safe for another month, and then they were out that night at a movie (or maybe something else, who knows) and all of a sudden they realize the moon is full again and that they're going to change again (and then they do).

Ok, so does anyone know if I'm making this stuff up or if it actually exists? And if so, what the heck is it! btw, is this the right forum for this?

~Snowy