A Warning in Ink

You dare call me a problem? Grrr... I found a fat red marker left unguarded on the floor and uncapped it with my teeth. I dragged its bleeding red tip violently across the corner of your abandoned cardboard shoe box, carving jagged slashes and a crooked skull. The cardboard groaned under my pressure, leaving thick crimson gashes. I left the cap tossed aside, grinning down at my handiwork. Keep testing me, and your precious cardboard domain is only the first thing to bleed.