I'm definitely going to participate in the Halloween themed StopmoJam 3.
I ditched my first idea, might do it as a standalone 1 minute film one day, but not for this. And now I have something simpler and suited to the 15 sec maximum I think. Started by making a couple of props, typical halloween decorations, to go either side of a door. So I can post pics and it won't give much away. (Also I could change my mind and still maybe be able to use them.)
This one is just a cardboard cut-out skeleton, so it was able to be finished first. The other one is a pumpkin, and it needs a light rigged inside. I have carved some polystyrene but I need to test to see if it will let enough light through to glow. I'm pretty sure jack O Lanterns glow, not just the holes cut out but the pumpkin skin lets some light through as well, though i live in Australia where we don't really do Halloween so I haven't seen one for a very long time.