Two words: food poisoning.
So, after I had half-way recovered from the wretched experience of involuntarily rejecting all of my bodily fluids and nutrients, I decided to go to the store and let the manager know. I was polite about it, realizing that it's not possible for a store to NEVER have a contaminated item on the shelf. The manager was pretty dismissive of it, and tried to act like I was crazy. I insisted on filling out a report anyway.
Then I decided to buy some smoothies and protein shakes, since I couldn't keep down solid foods. Guess what? About 20% of them were expired by TWO MONTHS, but they were marked down with the "Manager's Special" sticker, so that makes it OK.
No wonder people get sick from the food here. I think they must have sold me a rotten chicken, in the form of one of those roasted things. They pump them full of saline "flavor" solution to cover up the taste of rotten meat.