Some weird soup at a wedding that had a piece of bread in it. Not only was the bread getting soggy and gross, but the soup itself tasted awful, and there was huge onions in it, I hate onions. It looked like giant toe nails in some pee, with a chunk of flem in it. Oddly, everyone was raving about how good it was, but pretty sure they were just trying to be polite. It was the nastiest thing ever, even without considering the fact that I hate onions. Even if it did not have onions, it would still have been gross.
Another thing was a "defective" McNugget. I have no idea in what way it was "defective" if it was not cooked properly, or what, but I bit into it, and it had the most bitter nasty taste ever. I spat it out and threw the other half out without looking at it because I was too scared of what it would look like. It was like biting into a big chunk of poop or something. So nasty. I have not eaten one of those since. I always found that once in a while I'd hit one that had a mild version of that nasty taste, but that one time it was super strong.