Juamei,
Is it scratching on the rock, or a spraycan? It might make a difference to the criminal charge. Let's hope the arsehole is caught. I saw a similar sight at The Cockpit on Moor Divock, presumably scratched on by someone called Glynis, who is obviously a twat of the highest order, and wishes to be known as such:-
http://www.themodernantiquarian.com/post/46552
Cheers,
TE.