Justin Timberlake is on vocal rest due to bruised vocal chords and even had to cancel at least one concert because of it, but he didn't want to cancel his appearance on The Tonight Show! So they improvised! It started with a normal interview where Justin wrote his responses on a notepad or mouthed and pantomimed stories that Jimmy said out loud for him. There was even a little lip syncing! They still covered many topics, like how his cancelled show has been rescheduled for January 31st, Justin's birthday, and his new book! They tested out several other ways to communicate without the use of his vocal chords, and then brought out his wife Jessica Biel to see who knew JT better, her or Jimmy. Scroll to the third video to see that!