Order a small popcorn at the movie theater. People are very likely to eat more popcorn than they should in a dark theater.
Resist the temptation to do the same by ordering a small popcorn. Also, make sure you skip the butter. https://canvas.instructure.com/eportfolios/3002857/Home/The_Sweetness_of_Thoughtful_Gifts_Why_Wooden_Gift_Boxes_with_Honey_are_the_Perfect_Combination