It all unfolded Tuesday morning around 8:30 a.m. when a man, clad only in sneakers and boxer briefs, scaled a freeway sign and prompted the closure of the southbound 5 Freeway.
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The man, identified as 29-year-old Alexander Dunn, hung huge banners that read "fight pollution not each other," "give a hoot, don't pollute," and "Dephre," which, his producer told the Los Angeles Times, referred to Dunn's stage name of Dephree.
He stayed up there for about an hour, then did a back flip onto a large inflated air bag set up by police.
Dunn was loaded onto a stretcher and taken away by ambulance. He was booked on suspicion of delaying a police officer, trespassing and failure to obey a regulatory sign.
Dunn's producer King Graint, who posted to his Twitter account a video clip that Dunn shot of himself while he was on the sign, told the L.A. Times that the footage would be released tonight as part of a music video.
City News Service contributed to this report.