I just crossed an article on Cracked.com (yes, the same as the immature magazine) that lists some of the not-so-savory food additives and their sources. If you are a well-versed vegan then you know of these ingredients, if not then make this time to familiarize yourself with some things to look for when reading ingredient labels.
Some snips from the article:
“excretions of the Kerria lacca insect”
“the abdomen region that houses the fertilized eggs…ground into a powder”