This one makes me laugh. A friend of mine put it on a mix for me, and the first couple of times through I was sure I had to be hearing it wrong. I looked it up on a lyric search, though, and sure enough they're all going to call rats fish once Friday rolls around. I find rats funny to begin with, but the fish thing pretty much cinches it.

I guess you could also view this as historical commentary, but I choose just to see it in a ligher way.