Human tooth, that is REALLY bad, how the hell would they not notice that they lost a tooth.
I took it back, and got an exchange, so now I have a lovely looking cake cooling on the rack, and will ice it soon.
I've found tiny little brown silverfish-looking bugs in my ramen packets before. :/ That's definitely my pantry's fault, though.
Another time I looked at one of those Kraft pudding cup things that comes in four packs: it had MOLD all in it. I didn't open the thing, thank goodness. There was so much hideous black mold that you could easily see it through the side. I'm spoiled on premade pudding forever.