I remembered another odd thing I saw last Thursday: a completely black ladybug.
I also found a button (plastic with an anchor on it) and an earring (sliver fish). Button will go in my collection (it is in good condition, and I like buttons), and I'll clean up the earring to use as a crochet stitch marker. :)
Yes, I also pick up pennies when I find them, unless they're disgusting. That's just who I am.