The doctor is in! You've probably seen Dr. Fart's work around the city — on electrical boxes, lampposts, the occasional dumpster. It's hard to miss, as the elusive Dr. Fart — the alter ego of an up-and-coming comedian — has found the ideal prescription for inducing a smile: writing "Dr. Fart" in very public places. In the ever-evolving world of graffiti, Dr. Fart's work falls under the sub-category of toilet-humor "tagging" or "getting up." And spotting another Dr. Fart eruption gets a laugh out of us every time.