Cherenkov
Cherenkov Vodka is a beer company featured in GTA IV. Bottles of Cherenkov Vodka are used as Molotov Cocktails in the game. The Cherenkov Vodka is also a sponsor in the Venturas Poker Challenge.
Playboy X talks about Cherenkov Vodka in the mission "Blow Your Cover", if the player fails it once, as he talks about Russians (as he guesses that Niko is Russian.)
In Broker, there is a building on the eastern side of Iroquois Ave that features a sign for Cherenkov Vodka on top of it. The second "E" and the "N" are missing, making the sign spell "Cher Kov" (jerk off).