I'm not sure what happened here.
Well, I know exactly
what happened —I left both shutters open when I advanced the film — I'm just not certain
why it happened. I doubt that I forgot to press the release to end T mode, though it's possible. More likely is that I was using a self timer or cable to stop the exposure, and it failed to push the release in all the way.
Still, I thought it was interesting looking. I enjoy how you can tell that the film advance isn't a single smooth motion, but rather a series of short, quick ones them.