Joker Venom (Batman: Shadow War)

Joker Venom is one of Joker's signature weapons in ''Batman: Shadow War. ''It is a toxin, a favorite murder weapon used by Joker. It is also called Smilex, Laughing Gas, Joker Gas, Happy Gas, Giggle Gas, Joker Juice, Laughing Toxin, Laugh-A-Loads, Smiley Gas, Perma Smile and Joker Toxin.

Lethal
Contact with Joker Venom causes uncontrollable spasms of laughter, followed by a painful death. Victims often exhibit a grotesque grinning expression due to the spasms of facial muscles. The venom hyperstimulates the laughter functions of the brain, leaving the victim unable to breath. This is more often used than the non-lethal version.

Non-Lethal
The venom causes uncontrollable laughter, but instead of dying, their faces are often pulled into an unusually large grin as well as bulging eyes and paleness, putting the victim into a coma until an antidote is given to them. Prolonged exposure to the non-fatal forms will cause permanent brain damage. This less used than the lethal version and is only used for kidnappings and to keep someone he needs alive.