A friend of mine (who co-writes this fairly awesome blog) said it best when she termed it "the Department of Weird Things Spilled on our Interstate"
all over I-40
just about 30 minutes outside of Nashville, and about 15 minutes from my house
News story here...but there's not much there.
Other random things spilled on TN highways recently:
fuel (not odd, but it seems to happen a lot--most recently in January)
and there's more, but honestly I'm a bit too lazy to search the articles.