I nearly did once back in 2001. It was the beginning of grade 8 and I was doing my homework and eating some Hersey's chocolate when all of a sudden I looked down and noticed these little tiny bugs crawling in it... YUCK!!

It was soooo disgusting, it spat it out then threw away the whole thing. It's wasn't Hersey's fault or anything, I had just kept it for a long time in a little wicker basket on my counter for a while and I guess the bugs that crawl all over the home got in it.
But that traumatized me for a long time, lol