bubbles speak

How to stir things up a bit - reclaim the corporate advertising space for our own collective benefit!
(disclaimer: i do not endorse vandalism, so don't do it. but if you already see an ad desecrated with a blank bubble, the ice has obviously been broken already so no foul if you add to it!)

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There was a Canadian documentary about this on TV a long time ago, but recently I read that a guy in NYC is also doing it. He just puts blank stickers on advertisements and lets people write in their own comments. I like the "street bubbles" ones in the politics & social commentary.
http://www.thebubbleproject.com/01.Bubbles/BubblesFrameset.htm