In February 2005, Oosterman received worldwide attention when he was arrested at the start of the Auckland World Naked Bike Ride for refusing to put on underwear. He was covered in thick blue body-paint at the time. In court he pleaded not guilty to the charge of indecent exposure. To protest this charge, he stripped off in front of the courthouse with three other activists wrapped in a banner reading "STOP indecent exposure to vehicle emissions". He then ran into the court naked, but put his clothes back on for the plea hearing. The charges were later dropped due to lack of evidence.