For and her halloween contest. The deal was to draw her character The Makeshift Man and try to make it spooky in some way.
I'm not so good at spooky things, but here's the idea behind the drawing... According to Nordic folklore, you shouldn't sing or in any other way do something that may disturb the dead when you go through a cemetery at night. You see, the dead can be quite cranky (who wouldn't if you're waken up in the middle of your sleep?) and then they might say something to you to make you shut up. Most people get scared out of their wits and sometimes even lose their mind when that happens. According to the stories.
But MM has of course nothing to fear, because the dead are afraid of him.