Sideshow Bob's tattoos (thing)

1. "Die, Bart, Die" (Bob: "No, that's German for 'The Bart, The")

2. "Ouch Man!" (Bart's head on a skateboard)

3. a skull and crossbones

4. "LUV" (on one hand) "HAT" (on the other hand - with a macron over the 'A')