Invisible Children filmmaker Jason Russell was walking the streets of Pacific Beach in only his underwear Thursday afternoon and yelling incoherently, prompting residents to call authorities, San Diego police said.

Russell, 33, was detained and taken to a mental health facility, under a law that allows police to have someone evaluated for mental problems. A video has now surfaced allegedly showing Russell in the moments before police arrived.

The video on TMZ.com shows a naked man angrily pounding the pavement with his hands.

The mastermind behind the now-famous “Kony 2012” video was detained by police yesterday for allegedly being drunk in public and masturbating.