You've been sent this email because you are a Person of Special Interest. The Billboard Liberation Front is planning a large-scale improvement on Monday, May 30th—Memorial Day. I don't want to give away too much about the nature of improvement, but I will go as far as to say Morgan Spurlock would be proud...

Covertly Yours,
Milton Rand Kalman
BLF Chief Scientist

Okay, so we didn't eat the email. But after getting the call from Friend of SFist Scott Beale, we bummed a ride out to Haight and Stanyan where his sources assured him that, whatever was going to happen, it would happen there. Everything seemed so normal -- shoppers strolling the Haight, hippies offering 'green buds,' people getting dressed as Ronald McDonald in Golden Gate Park. Wait a second! That's when we realized that we were smack dab in the middle of 'Art.'

After the jump: A billboard is liberated, a crowd of Ronald McDonalds and Hamburglars celebrate fifty years of McDonalds, and then the cops show up and spoil the party.

Update: SFist brings you EXCLUSIVE video of the animatronic Ronald McDonald and the exciting getaway by the Billboard Liberation Front (torrent of the raw Mpeg or 1.3 MB Windows Media).

Additional reporting and video by SFist Sarah -- check out her analysis on Forward Retreat.