Sneezing and Coughing Are Your Worst Enemy
Even if you don't go into surgery with one of the worst colds of your life (yes, I did try to reschedule), you might have to sneeze or cough in the days following your surgery. It is not pleasant, and you should do everything in your power to prevent either from happening. But if you are unlucky and feel the urge to do so, you must apply pressure over your incision with a pillow. Otherwise, you better hope you aren't that far from your last dose of NorCo.
Oh, and the same applies to laughing.