Winnie and Frances hold up cards that they've drawn or play in the background during filming and have even hilariously interrupted some of Fallon's celebrity interviews. Fallon jokingly told PEOPLE that he gets his girls to behave through bribery.
"[They] love Lego Incredibles on PlayStation — it's their favorite thing in the world," the star said at the time. "So if they're not in the mood [to be on camera] or if they're being too silly, I can say, 'Hey, if you help me out with this, I'll you play an hour of the Incredibles on PlayStation.' "
5 More Sleeps 'Til Christmas will publish on Oct. 27.
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