In graffiti art's long-running battle for recognition and respect, the enemy of progress often comes from within.

For every caustic new Banksy, there's a bus stop with a black marker penis.

For every Saber trying bring down the political elite, there's a hundred idiots with tags like chemical accidents.

And for every Shepard Fairey creating iconic images of future presidents, there's someone, somewhere, flogging used tires by painting Barack Obama crudely on a wall.

obama crying

It is this side of graffiti - the naff, the crude, the purposeless - that is the subject of Scott Hocking's new book Bad Graffiti.

The Detroit-based sculptor and photographer has been taking snaps of badly executed street art and examples of urban illiteracy since 2007.

Here's a small selection of the 'gems' he found. If nothing else, they should help you appreciate the proper stuff more.

Loading Slideshow...
  • Eightball

  • Eat Me

  • Nice Boat

  • Church of Dork

  • Illuminati

  • Book Cover

  • You Can Jump

  • Death Road

  • Dr Butt

  • Dream Team

  • Fuck You

  • Have A Nice Fuckin Day

  • I'm Shootin

  • Kissing Avenue 2010

  • Mac N Cheese

  • Obama Crying and Smoking a Joint

  • Shit