So: Pharrell dresses like the bellhop kid from The Grand Budapest Hotel. He recites head-blown slam poetry and then lurches into an overblown gothed-out film-music version of “Happy” with dancing violinists. Lang Lang plays a solo for no reason. Hans Zimmer, in his tuxedo, plays his axe. There was a Ferguson tribute in there, I guess? None of it makes any sense at all! The song isn’t remotely built to accommodate this absurdity! And yet the trainwreck appeal is real.