Apparently someone walked onto my village's grounds and got their cart stuck, and decided the best thing to do was grab the nearest stone in our town and turn it into a runestone and put it into their cart to leave a message... I'm a little pissed about them destroying my stone, but I still have one left in the town.
Though I'm a little confused, I only saw trespassing scents even one right next to where the stone was, do they not need the vandalism skill to turn stones into runestones on a village claim?