Motorist + Courier + Road Rage = well, you know.
The posting on this at BoingBoing.net summarizes the basic incident the most neatly. In a nutshell: a contretemps arises between a bike courier and a motorist over the motorist's littering; motorist goes all road rage on the courier; photographer documents the entire episode.

The wankiness is all located in the comments thread on the Citynoise web site, where the photog's pictures are posted (takes a while to load, as there are LOTS of images). For the most part, the commentors comes out in favor of the courier, on the grounds that littering, throwing coffee on someone, and trying to beat someone up and wreck their bike is generally uncool. Some argue, however, that tossing litter back in the motorist's car and keying his car is also uncool. Lots of bickering ensues, especially right around 00:48 GMT, with the comment "Seriously though, regardless of what she said, she should have been smarter, people have been murdered over less." This is answered with "Oh lord. Don't you start on that too. Please give me ONE example of someone being murdered over litter." And off they go.

There's more downthread as well, including some rather dorky photomanips. It's not the wankiest of comment-thread debates, but it's amusing.