Last week’s presidential debate, tomorrow’s vice presidential debate, next week’s second presidential debate, your writing group’s punctuation debate . . . ‘tis the season for hashing out the big issues, isn’t it? And for writers, creating the perfect rhythm for your fictional conversations is a big issue. If you want a character’s words to trail off, use ellipses as I did above when I let my list of debates trail off. But for an interruption, the almighty em-dash can’t be beat. Think of that long line as a chop at the throat, a hand slicing through the air in a forceful cease-and-desist motion: “But I want—” “Enough. It’s not up for debate.” Did you feel that verbal karate chop? That’s a satisfying interruption.