It was in my room. It was inside the house. Nobody noticed. No signs of break-in. No footprints--sorry, handprints--in the snow.
I walked into my room an hour ago. This was on the wall, pinned up.
It had taken down one of my posters. Ripped it up, in fact. Put this up instead.
It's another code. It's playing games with me.
The Howler is just having fun.