How did you contribute to Paranormal Activity‘s recent success? Did you talk about it on Twitter? Did you drag your friends to a showing? Did you purchase Dramamine just so you could sit through it?

Even if you’ve watched the movie multiple times already, this promotional tool could have you buying the DVD as well. Those who register by Monday, November 9 will get to see their name listed in the home version’s credits. According to the website, it’s simply the studio’s way of “thanking the fans who turned the movie into a nationwide phenomenon.”

This could be the one time a movie’s credits ran longer than the actual film.