Watch Justin Bieber and James Corden sing 'Smelly Cat' and arm wrestle for Carpool Karaoke

Wife Guy Justin Bieber and his doomed mustache (RIP) joined Late Late Show host James Corden to "drive" around, belt out some tunes, test out some choreography, talk about whether Biebs could take Tom Cruise in a fight ("I'm dangerous! My agility is insane! I'm the Conor McGregor of entertainment!"), and croon "Smelly Cat" from...