This just cracked me up! This is a quote from Sandy Wiseheart, editor of the Knitting Daily newsletter:

"The ONE exception to the Animal Fibers Are Candidates For Felting rule is silk. Silk comes from silkworms, and I would argue that worms are not animals, they are worms, thus: bugs. Silk is not worm hair. Silk is extruded from the worm; silk starts out as a liquid. (Ahem. Use your brains, here, folks: "extruded" plus "liquid" equals...oh yes. That's what silk is. Hardened Bug Extrusion. Very pretty and wonderful hardened bug extrusion, it is, too.)"

Now, I LOVE silk but somehow, I don't think I'll think of it quite the same now that I fully realize that it is basically... wormsh*+. Doh!