Go to any public bathroom stall, and you can expect to find the following examples of vandalism:
None of these items were visible during my frequent visits to the filth-factories at PAX, but I did stumble upon the above inscription, which apparently is the closest to hardcore vandalism that 60,000+ geeks get. Yes, it's just "No More Heroes" scrawled on the wall, confident that you'll "get" it. This is perhaps the only time graffiti's been productive.
You GO, gamers!