At a work conference, where a catered lunch is being offered. There are specific sections for dietary requirements with limited supplies eg vegan, gluten free, nut free, along with a larger section for ordinary non-vegetarian sandwiches with ordinary bread. The guy ahead of me takes something from every single section including the ordinary non-vegetarian section, so clearly is not a vegan with gluten allergies! Why do people do this? As someone with specific dietary requirements I've been left many times with very little to eat because others have eaten food without thinking about whether others might actually need it.