You know that your vote doesn't matter in large-scale elections. Being a busy person, you don't go out of your way to vote. When discussing an election with a friend, you mention you didn't vote. Your friend and others in the group socially ostracize you. You don't understand why, but after a few times you just say that you voted. In all future elections, you leave work early and indicate to your friends that you voted. You know your vote doesn't matter, but you also know expressing that sentiment has no benefit. You secretly wonder if the pressure to vote is a social norm engineered by one side. After some time, you hear a new friend indicate they did not vote. You publicly scorn them, for the social benefits.