What is the favorite game of Vincent and his brother?

Vincent and his brother, Anton, enjoy playing a game of "chicken," which is a game that tests their bravery and willingness to risk danger. This type of game serves as a metaphor for their relationship and the larger themes of the film, such as the struggle against societal expectations and genetic determinism. The game embodies their rivalry and the idea of pushing boundaries, as Vincent, who is genetically disadvantaged, is determined to prove himself against Anton, who represents the ideal genetic model. The act of playing chicken symbolizes Vincent's desire to challenge the constraints placed upon him and to assert his identity beyond his genetic makeup.