If you eat something and no-one sees you eat it, it has no calories. When you eat with someone else, calories don't count if you don't eat more than they do.
Food used for medicinal purposes has no calories, eg. hot chocolate, brandy, toast, ice cream.
Movie-related foods have no calories as they are part of the entire entertainment package and not part of one's personal fuel, eg. Broken biscuits have no calories. The process of breaking causes calorie leakage. Things licked from knives or spoons have no calories if you are in the process of making something, eg. Foods that have the same colour have the same calories, eg. mushrooms and white chocolate, spinach and kiwifruit ice cream.