When our teenager uses “All of my friends are going” as an argument, she’s guilty of using the bandwagon fallacy—accepting a statement as true because it is popular. Unfortunately, bandwagoning can sometimes persuade passive audience members who assume that an argument must be correct if others accept it (Hansen, 2002). But credible speakers and critical audience members must be careful not to confuse consensus with fact. A large number of people believing in ghosts is not proof that ghosts exist.