'Speak now or forever hold your peace', the words said by preachers at the end of wedding ceremonies all over the world, right before the vows. It's a last chance for protest, a moment that makes everyone's heart race, and a moment I've always been strangely fascinated by. So many fantasize about bursting into a church, saying what they'd kept inside for years like in the movies. In real life, it rarely happens.

Real life is a funny thing, you know. In real life, saying the right thing at the right moment is beyond crucial. So crucial, in fact, that most of us start to hesitate, for fear of...