The folks over at Gothamist have their knickers in a tangle over Sony’s PlayStationPortable graffiti ad campaign. A few weeks back, they published an editorial called “Corporate Graffiti Sucks Balls” (bottom line: “Please cut this crap out. Quit it!”). Now they’ve started an online petition to try to pressure Sony more directly. And they’re getting some support, notably from the Wooster Collective, which is collecting images of defaced Sony PSP ads.