Apparently "Kilroy" is specifically an American thing, but I don't think it is too obscure. For the curious: http://en.wikipedia.org/wiki/Kilroy_was_here http:

Apparently "Kilroy" is specifically an American thing, but I don't think it is too obscure. For the curious: http://en.wikipedia.org/wiki/Kilroy_was_here http://en.wikipedia.org/wiki/Kilroy_was_here I thought it was a good comparison because of the "graffiti/website defacement" angle.