When I was a kid, I would often bring a glass of juice or koolaid down into my room, finish half and leave it there for months. Well one time, I brought a glass of grape koolaid in my room, unknowingly placing it beside another glass of grape koolaid that had been there for a few months. I reached out, seeing with my peripherals and grabbed the wrong glass. I put the glass to my mouth and felt a a thick, furry chunk of mold slide into my mouth and down my throat. I didn't know what it was at first until I looked in the glass and saw the green/purple mold with hair on it and little drowned flies stuck in the mold. I never left a glass in my room again.
I know it's not food poisoning, but it's still disgusting.