What a Jackass! Johnny Knoxville was detained earlier today at LAX after security found a fake grenade in his carry-on bag.


TMZ is reporting that the Jackass star was in terminal 4 (American Airlines) when security screeners saw something suspicious.

Knoxville was detained, cited and released. Although the grenade was fake, the prankster was cited for carrying a "prohibited item" into an airport–replicas of weapons are not allowed.

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