Humans are creatures of habit with an insatiable need to see familiarity in other people’s actions. Your predictability gives them a sense of control.
Turn the tables. Be deliberately unpredictable.
Behavior that seems to have no consistency on purpose will keep them off balance, and they will wear themselves out trying to explain your moves.
Taken to an extreme , this strategy can intimidate and terrorize.
Resource : The 48 laws of Power.