The Gentleperson's Guide to Visiting Etiquette

I don't really mind graffiti since I built a crap-ton of Training Walls and hid them all over Springfield. I usually clean them up almost immediately as their laid down, so it really doesn't hurt me all too much.

If the neighbor I'm visiting has a really high level, or high star count; I won't lay down some graffiti. I think it helps newer players a bit get the gist of neighbor visits and helps them improve their Righteousness Rating.