Jackass Johnny Knoxville detained for bringing fake grenade to L.A. airport 01/16/2009 Johnny Knoxville apparently learned an airport is not a good place to bring a grenade -- even if the explosive is a fake. Read More RELATED NEWS Steve-O engaged to girlfriend Lux Wright: "I'm so happy"'Jackass' and 'Viva La Bam' star Vincent "Don Vito" Margera dies'Jackass' star Bam Margera marries Nicole Boyd in Iceland TAGS: Johnny Knoxville