Two kids dressed up as a wizard and a knight are just about to knock on the door of a strange house. They don't even know who lives there. Winter has come early this year, so the house is covered in snow.
What they don't know is that the house is a hideout for pirates who have somehow survived to the present day. They have so had it with the whole "trick or treat" business that they have set up a very special treat for this year -- they will blast anybody who dares to knock. Wrecking their own door is accepted as collateral damage.
I built this diorama for the second round of the "Dem Bones Haunted Halloween" contest over on MOCpages.