Reply #2: Definitely a gang sign.

[last_texas_dem]

Nah, I'm just kidding. I have noticed this before, too, and wondered if it meant anything. Your post made me think of something I read on Snopes a few years back re: the meaning of shoes slung over power lines, where one of the common interpretations (and one I had heard growing up) was that the shoes were meant to be a gang sign!

http://www.snopes.com/crime/gangs/sneakers.asp