Well, I'm not sure you could call writing in the dirt with a finger vandalism. It's certainly not like attacking a train with a can of spray paint is it?
It sort of reminds me of those slogans you see written in the dirt on the back of white vans. You know, things like "also available in white" and "I wish my girlfriend was as dirty as this van". I'm sure there are loads more you lot could think of to brighten up a wet, miserable (here at least) boxing day.