Toenails
It is a proven fact that discovering a piece of another person's body in your meal is utterly repugnant on a soul-grimacing level. With the mere prospect of finding a hair in their pasta at a restaurant, people cringe. And for some reason, the most unsettling parts of mankind seem to be these outcast fragments.
Perhaps it's because, while losing an entire finger would obviously be terrifying, this injury is obviously the result of a major accident. Outside of horror films, nobody intentionally sticks their finger in their food. A fingernail, though? That is simply the outcome of someone being disgusting. A toenail, too? That is very disgusting.
No location in the world has a worse problem with toenails and fingernails appearing in food than Aldi grocery franchises in the UK and Australia, despite how perplexing that may sound. Toenails have been discovered in bread and pasta sauce, whereas fingernails have been discovered in pizza, ice cream, and sardines.
It's difficult to determine whether each of these allegations is accurate or if there's a widespread plot to falsify nail clippings in Aldi products. But even if it's a combination of the two, it still implies that someone is doing it someplace in a kitchen, which is disturbing.