premise: people are enjoying food at a crowded restaurant. hypothesis: A lone person eats sadly at a truck-stop in the middle of nowhere.
contradiction: There cannot be both a person and people, they are either enjoying or eat sadly but not both, and they cannot be at a restaurant and a truck-stop at the same time.|contradiction: A lone person is not people.  Enjoying food is the opposite of eats sadly.|contradiction: THE LONE PERSON EATING SADLY IS CONTRADICTORY TO PEOPLE ENJOYING FOOD.