In tins of beans (KTC branded, kidney beans IIRC) there were small black beetles, this wasn't just one tin, it was three I opened consecutively I don't buy any KTC things now no matter how cheap they are!
I also found what was either a chunk of bone or a stone in my vegetarian haggis a couple of months ago. I should have taken a photo and complained but I just wanted to forget. Still haven't forgotten and that's ruined veggie haggis for me 
A nice big chunk of chicken in my paneer masala, been a while sine I've had issues with takeaways!
when I worked at PGL I had a mouldy wrap, found a massive beetle in my curry one evening and in the same week a colleague found a massive chunk of glass in her angel delight-style pud.
Weevils/flour mites in our flour and other "pantry" items. Housemate had been to France and bought a huge mix of flours and it came from one of those we had to bin most of the non-tin foods in two massive cupboards.
I can't eat blackberries/raspberries because of the maggots, too many bad childhood experiences! If I have cauliflower or brocolli I have to check the heads for bugs/caterpillars. Usually I just avoid them though!
When I was a teen and on holiday in Lanzarote I bought tinned chickpeas (we were self catering). I used to just eat them out of the tin so was merrily snacking away and couldn't work out why they were oily. Huge fucking lump of spam in it 