Urban installations are notorious for being rich with meaning and usually have a deeper meaning. Some of them are just downright witty and may even get the biggest of prudes to allow a smile in appreciation.
One of the best ways to make a clever piece of graffiti is to use the environment to your advantage. For instance, using the likeness of certain urban shapes and elements and augmenting them to portray your message. For example, sometimes all it takes is adding a pair of googly eyes to something you find that resembles a face -- hopefully it is more elaborate than that, but you get the idea.
The best part of this art craze is that anyone can partake!
17 Pieces of Witty City Graffiti
More Stats +/-
Interactive Street Art
Comical Storage Drains
Compassionate Alien Street Art
Eyeballed Urban Fixtures