Director Jeff Tremaine tells the story behind the 1997 footage of Knoxville shooting himself, which appears in “Jackass: Best and Last,” and how the franchise actually started. Director Jeff Tremaine first met his “ Jackass ” co-originator and ringleader Johnny Knoxville in 1995 on the set of Spike Jonze ’s legendary music video “California” for the band Wax. At the time, Tremaine was the editor for the skateboarding magazine “Big Brother.” Two years later, in 1997, Knoxville pitched Tremaine