From Snow Crash...

These days, most states are franchulates or Burbclaves, much too small to have anything like a jail, or even a judicial system. So when someone does something bad, they try to find quick and dirty punishments, like flogging, confiscation of property, public humiliation, or, in the case of people who have a high potential of going on to hurt others, a warning tattoo on a prominent body part. POOR IMPULSE CONTROL. Apparently, this guy went to such a place and lost his temper real bad.

... and then from CNN...

An inmate serving a life sentence for molesting and murdering a 10-year-old girl named Katie was apparently forcibly tattooed across the forehead by a fellow prisoner with the words "KATIE'S REVENGE," authorities say.