So between a conversation on here and in talking to a vegetarian friend of mine, it's occurred to me that there are a lot of things that occur in common foods that people don't know about. Originally this was all the animal products that people don't know about in their food, but I'd be interested in hearing any other ones. I'll start with a few off the top of my head:
Caesar salad dressing: contains anchovies
Worcestershire sauce: contains anchovies and tamarind
Jello/gelatin: Processed animal bones and/or hooves.
Anyone have some other odd ones to add? I'd especially like to make sure I don't inadvertently feed one of my vegetarian friends something with meat.