Only a few listed here, much more at the link.
Yuck, just yuck!
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Beaver anal gland juice (Castoreum): in vanilla and raspberry flavoring.
Castoreum is made from secretions that come from the castor sacs of a beaver's anus.
This flavoring is used in many vanilla and raspberry flavorings.
You usually won't see castoreum on the label, because it's listed as "natural flavoring."

Dehydrated fish bladders in beers
Some beers use an ingredient called isinglass, which is made from dried fish bladders.

Maggots and mites in canned mushrooms
The FDA legally allows 19 maggots and 74 mites in a 3.5-ounce can of mushrooms.

Human hair in bread dough
L-cysteine is a non-essential amino acid made from dissolved human hair or duck feathers.
It's used to add to texture to breads.

Dog heat hormones in wine
Some wines, sodas and juices contain a preservative and anti-fungal ingredient called methylparaben,
which originates in a female dog's sexual organ during heat.

[link to www.wtae.com]