The Rocky Horror Picture Show - first saw it when I was twelve... and it's probably the reason that I'm so... unusual. It really kick started my love of musicals, too. I lost count of how many times I've seen it, I know pretty much every line and every song.
Secretary is one of my favourites, Cabaret, I loved Gypsy, Velvet Goldmine, Young Adam, Moulin Rouge...
I dunno, I go through stages of being obsessed with a film

xx