Difficult if not impossible to enforce, although I agree wholeheartedly with the OP. But I have to agree with Kuki-it's the PASSENGERS!! These louts are going to continue cruising and ignoring the rules no matter what. However, I do think that announcing 15 min. prior to showtime that any unoccupied seats in the theatre can now be filled is a good idea-and enforceable. Would stop those idiots who show up for their saved seats when the show has already started.