All I can do is speculate: since singer Paul Simon is on a revival concert tour, perhaps Brother Leader felt a need to show who has the real claim to be "Still Crazy After All These Years."
Was it a pep rally? Why is he pumping both arms? Why are they driving so fast? It's the strangest thing since the bizarre umbrella appearance in February (and see comment here).
Oh, and the hat. Don't ignore the hat.