Idiots invading my space!!!!!

I keyed some *** hats car once. Came out of the grocery store to pretty much the same scene, parked off at the end of a row, a dozen empty spots next to him. About 20' away I can see the red paint from his car on my passenger door (I always back in). I took my house key and made a 12" long arrow on the door. At the end of the arrow was a 1/4" chunk of my white paint still on his door edge.