I worked in a few food places when I was young, really puts you off buying anything packaged. You think, something like a pizza has many ingredients, each ingredient comes from a different supplier, there's so many places for skank to get in to your pizza or anything it's unreal!
Actually, a bloke I knew worked for a bread factory, someone threw up in the bread mix , they just carried on as normal. Girlfriend worked in a sandwich place for petrol stations, most of the people there were 16 and under paid, you can imagine what went on... I still can't touch garage sandwiches and if I have too have select ginsters and even then, pull the top off to have a look, make sure there are no food related land mines.