When Jeremy Mora sent his image of an LA billboard under a pristine blue sky, I thought it had already been culture-jammed--or, if not, it soon would be, given the easy target it poses. This morning, I spotted The Daily Irrelevant's link to a Billboard Liberation Front-altered version of the ad:
Dept. of Corrections: As Visual Resistance points out, it was the California Department of Corrections, not BLF, who did this jam. Apologies for not reading the fine-print.