Young nuns climbing every mountain. Busty redheads under the sea. Dog-lovers over the rainbow. If someone in a movie is singing, San Franciscans love to sing along. But what about a quote-along? The Jim Henson cult classic Labyrinth is perfect material for just such an outing, as Jareth, Sarah, Hoggle and friends come to life at this Alamo Drafthouse-presented screening. (Don’t worry, there are songs, too. David Bowie songs).