Watch this video animation from an interview with Alfred Hitchcock about the MacGuffin.
Write a short piece where the macguffin object is specifically addressed as being so important that it's not important why. This can be just a scene where many things like back story and character building are assumed to be fleshed out previously, a vignette where neither of those things are important, there can be a series of short lyric poems centered upon an object, or a person (or a part of a person). However you interpret it. Try to include a 'wounded' person. Someone not necessarily damaged goods, but with something in their past that at least in some ways, drives them.
