Ryncol

Ryncol is an extremely potent liquor native to the krogan homeworld of Tuchanka. Its exact composition is unknown, but it is clearly a very strong drink, given that it is a brew created by and for the krogans. It is mentioned twice in Mass Effect 2, at one point on Tuchanka, and another when Shepard visits the Dark Star Lounge, if he/she asks the bartender enough times for a drink (fifth time, after the bartender serves Shepard a glass of uncut batarian ale). The bartender warns that Shepard will "set of radiological alarms" after he drinks it. After drinking it, Shepard passes out, waking up in the men's room of the lounge.