I also had an instance on Thai. Eating my meal, there was a large mushroom. I bit into it and thought, 'that's not right' but stupidly swallowed it instead of spitting it out. I had a connecting flight, so that was interesting, and was up all night doing what you do when these things hit.

Didn't report it as there is very little chance of tracing the source.

I also have a cast iron stomach by the way.