The correct answer to this open question is the following.
A sports psychologist observed the behavior of fans during an especially violent hockey game. He found that as the game progressed, spectators became more belligerent and hostile, not less. These findings present a direct challenge to the assumption that vicariously discharging aggressive impulses reduces aggression.
Quite the opposite, the fans became more aggressive as the tension of the game arises. In competitive sports such as football, baseball, and basketball, fans show different kinds of behaviors. However, one constant behavior is aggression. They express aggressive conduct and express insults to the other team and its fans.