Yes! Bakemonogatari was one of my favorite series of the last several years, thanks to the combination of SHAFT's surreal visual style and the expertly told saga of former vampire Koyomi Araragi's quest to help girls solve their supernatural personal problems.
One of the somewhat weirder aspects of the show (and of the novels it's based on) was its constant allusion to events that happened in the past that you, as the reader, are unaware of. Whenever Koyomi mentions what happened to him over spring break or Tsubasa talks about what happened over Golden Week, you're left to wonder just what happened and how it affected who the characters are in the present.
Perhaps the most interesting (or at least relevant) of those past events is spring break, when Koyomi was turned into a vampire, and his encounters with Meme Oshino and the vampire Kiss-Shot Acerola-Orion Heart-Under-Blade. Yes, that's her name.
The events are teased in a gorgeously-animated sequence at the beginning of Bakemonogatari's first episode (captured below), but nothing more is seen of it. Now it's being turned into a movie, Kizumonogatari, at least according to a sticker seen inside Hanamonogatari, the latest work from series author NisiOisiN.
Now, hopefully, SHAFT will have the time and money to actually finish the movie before it hits screens.