The mining of old TV shows for new movie ideas continues with this latest news: they're turning 'Gilligan's Island' into a big-screen movie.

How is this seen as a good idea in the executive offices at Warner Brothers? How exactly will they make a one-time 90 minute movie out of a dumb (but in a lovable way) show from the 60s? As we've been saying here for the past several years, big-screen adaptations of old TV shows usually don't work ('Bewitched,' 'The Beverly Hillbillies,' 'Charlie's Angels,' the list goes on and on) because it's not that those shows necessarily had brilliant plots, it's because they existed in a certain time and had a specific cast that we love and remember. Bob Denver is Gilligan. I'm not going to go see a big-screen version just because they cast, say, Christopher Mintz-Plasse in the role (no casting yet, but I can picture him being considered).