What is an example of a bandwagon appeal?

A bandwagon appeal is one that plays on target customers' loyalty in another direction. Examples are; If you don't ____________ then The Terrorists win. No fan of (local sports team) would be caught dead without a _______ If you don't have a ___________ you can't call yourself a true __________
I'll give a quick example. It goes like this: "If everyone is doing it, why don't you?" This appeal is that if everyone believes in something, the reader should too.