The stars had to play vodka chess, a version of chess whereby after the defeat of a pawn, the player has to consume a vodka shot, for a scene in the upcoming film.
Confirming the news, a spokesperson of the film said: "A scene in the film requires both the actors to play this game. It's a slightly different version of chess which is very interesting".
The trailer of "Wazir" was released on Wednesday, and shows Farhan joining forces with Big B to fight against a common enemy Neil Nitin Mukesh, who plays the main antagonist.
"Wazir" also features John Abraham and Aditi Rao Hydari in key roles.
Directed by Bejoy Nambiar, the movie presents Farhan as an ATS officer, Big B plays the role of a physically disabled man with a sharp brain and Aditi is seen as Farhan's love interest.
"Wazir", co-produced by Vidhu Vinod Chopra, is slated to release on January 8, 2016.