Johnny Knoxville and several other members of the cast of Jackass were spotted while filming scenes for The Discovery Channel's forthcoming Shark Week in Los Angeles on Wednesday.The 51-year-old daredevil was joined by two of the franchise's veteran members and several newcomers to the series while working on a stunt in which Jason 'Wee Man' Acuna appeared to be the main subject.The group's sighting occurred just after former cast member Bam Margera was found after leaving a rehabilitation facility in Florida on Wednesday evening. Hard at work:Johnny Knoxville and several other members of the cast of Jackass were spotted while filming scenes for The Discovery Channel's forthcoming Shark Week in Los Angeles on WednesdayAlso present during filming was series regular Chris Pontius, as well as new cast members Zach Holmes,Sean 'Poopies' McInerney and Jasper Dolphin, as well as his father Compston 'Dark Shark' Wilson.During the skit, Acuna donned a helmet and what appeared to be a shark fin while standing in front of a clear container of water.
