Pictured: The winners of last year's Halloween Costume Contest: Headless Harry Potter and Iron Man

The air is turning crisper, the leaves have fallen from the trees, and all the good little goblins and ghosts are preparing to trick 'r treat their way through the night. But before you head off with the kiddies intent on filling up bags with sweet goodies, and before you get down and party with all your friends, be sure to enter our annual Halloween Costume Contest!

Once again, we have two terrific prize packages, one for kids under 18 and one for adults over 18. All costumes must be movie-related; submissions are open through Wednesday, November 3. Check out the prize packages right here, where you can also find all the information you need to enter the contest. If you're still waffling about your costume, Moviefone came up with a host of ideas to get you started; you can also take another look at our contest winners from last year. Or maybe you can come up with a costume based on 'Let Me In,' 'The Social Network,' or 'Paranormal Activity 2.' (OK, those might be stretching it.) Even better: surprise us! Just don't forget to enter. Good luck, everybody, and drive safely and slowly on Sunday for Halloween.