That's how you clean up the neighborhood :
http://itsnicethat.com/articles/2818
/via @meaganfisher

COPS: In every nation, in every age, you tell us you’re indispensable, that without you we’d all be killing each other. http://bit.ly/aD2Gk2

The ones who beat Rodney King, gunned down Oscar Grant, murdered Fred Hampton in his bed.
http://crimethinc.com/blog/new-poster-the-police

Reverse graffiti videos were /via @zefrank

Artist cleans bridge with reverse graffiti, then paints with the collected soot.

http://youtu.be/JwsBBIIXT0E
http://youtu.be/BbilMM16Kgs