You are not drawing on God's walls. You are drawing on OUR walls. We will judge you & prosecute you! (Graffiti was voted one of worst low-class behaviours by Criminal Researchers. 90% of Graffiti "artists" (read criminals) went on to become drug-addicts, drop-outs & losers in life.)
Click through for 20 examples of some pretty cool literary graffiti (not that we condone vandalism in any form. Art is ok, though).