Can't Keep a Good Mask Down: The hockey mask used in the original "Friday the 13th" movie disappeared last week but surfaced two days later--similar to the way its wearer, the movie's homicidal killer Jason, keeps reappearing in sequels. Film director John Waters said he obtained the white plastic mask as a gift for a friend, but that it was stolen off the porch of his Baltimore house when it was delivered last week. Waters reported the theft to police and placed the value at "priceless." Over the weekend, a city police officer received an anonymous call with instructions as to where the mask could be found. Postal authorities recovered the mask from a mailbox.