I thought it would be this.
Here’s a story I’m glad to have heard third-person, a few years back:
This guy (FOAF) takes a bite of a Reese’s Peanut Butter Cup, and finds the entire inside (where the peanut butter formerly was) fully replaced and infested by a pile of maggots all crawling all over each other.
One morning sleepy as hell, pre-contact-puttin-in, I made some Pancakes from the box mix stuff. A couple bites in I saw there were poppy seeds in my pancakes, which I though was weird. After about 10 seconds I corrected the thought to that’s not weird, that’s just completely fucking wrong. Upon closer inspection I had Buttermilk Complete mill-bug farm in my pantry, and therefore my pancakes.
I had a small moth go deep into my ear one time. I’m talking deep.
Once, I ordered a seafood platter for lunch. One of the breaded scallops had a breaded fly sitting on its surface, forever immortalized in deep-fry oil.
While enjoying some mojitos back when they were hot, a friend and I noticed the mint was a little gritty. No problem, plants grow in soil, it happens. After a few rounds, the mint was more closely examined. It was infested with hundreds of tiny snails, perhaps the size of poppy seeds. We shrugged and continued on but maybe left more of the mint in the glass than before the discovery.
Ok, that made me howl! Great story.
I’ll be checking my homegrown mint a lot more closely going forward. 
I hate that. Then you can hear them moving around, but you can’t really get them out, and their little wings and legs are making more and more noise right next to your ear drum, and it’s so CREEPY. Yuck.
I ordered a salad once and it came complete with a piece of a broken, plastic, dinner fork (?) and a large winged insect of some kind, both nicely tossed and coated with the dressing. The insect was still alive when it reached the table. I did not eat or pay for my salad. I think it was the fork more than the insect, though, that made me decide not to eat it.