At first glance, it looks like someone's sign/prop/artistic effort either got dislodged or fell. Hubby says it looks like a Macy's Thanksgiving Day float that finally got away.
But then, when you look down at the bottom, you see what is actually going on. Neat, huh?
Here's another take with a few more "items" that only flossing can "remove" from between your "teeth". :)