Boomshine is the name of an highly volatile illegal liquor in the Grand Theft Auto series. It featured in Grand Theft Auto: Vice City, Grand Theft Auto: Vice City Stories, and on Grand Theft Auto III's Liberty Tree article. Boomshine's fumes itself are apparently enough to make a person drunk. It is a parody of the illegal spirit moonshine, which is also highly volatile.
Description and Appearances In-Game
GTA Vice City Stories
In GTA Vice City Stories, Phil Cassidy had a cache of Boomshine in a warehouse in Little Havana. Phil asked Vic Vance to drive him because of a threat of an attack by the Cholos. Upon arrival, Phil noticed the door was open. He lifted up the door and was blown back by an explosion. Phil, knowing the volatility of the liquid, knew that should the Boomshine get heated up, a massive explosion would follow. Vic decided to save the liquor using a Forklift to avoid a large explosion that would destroy the warehouse. This cache would later be used by Phil to defend himself and Vic from Jerry Martinez's goons.
GTA Vice City
In GTA Vice City, Phil would be at his property in Little Haiti testing an explosive he wanted to show Tommy Vercetti. Phil, in his drunken state, did not take any caution in preventing a possible accident. The result: Phil got his arm blown off. The Boomshine's ambient fumes had given Tommy a drunken haze but he still was able to drive Phil to a hospital. On their way, Phil recollected some war memories during the drive (possibly giving him the idea that he lost his arm in Nicaragua). A killer who hated Love Fist also attempted to use it to kill them, only for them to disable it and survive.