Graffiti are illegal, but admit it, they are *most of the time* very cool to look at. Graffiti is a form of writing, drawing, or scribble usually on a wall or other surface as a form of artistic expression but without permission and within the public view.
Some graffiti are annoying, like profanity or explicit doodles. And these are the types of graffiti that nobody wants to see and appreciate. However, some people use graffiti to motivate others or just to give humor.
People of the internet share the insanely polite and overly decent graffiti they have seen, and boy, these are very hilarious!