While dining, 1. Sometimes, people expect to get served good tasting food item, but later find out that it is spoiled instead, now since they have gotten into that restaurant, the manager will fight with them and get payment for it, but since it is not edible, they have to throw it. They may be new to the place, or the restaurant, so don't know where else to go, may be in so much of hurry that they can't go sueing the manager, or maybe something else. 2. Sometimes, even at home some people take pride in leaving some amount of food in the plate. When confronted, they will argue that they have eaten everything and nothing is on their plate. They argue that "it is none of your business", "why are you up to changing the world", "you have so many bad qualities, improve yourself first", etc. 3. Sometimes, it is a tradition to force feed the guest, albeit politely. When food becomes too much, the guest has not much choice, except to leave it on the plate, since the hosts continue to compel "thoda sa aur le lo, bas thoda sa" "aap ne to kuch ni khaya", etc.
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