Once upon a time, there were two warring boy bands: *NSYNC, a dance-focused fivesome led by Justin Timberlake, and the Backstreet Boys, a quintet with a penchant for layered ballads.

Former NSYNC members Lance Bass and Joey Fatone finally put an end to the '90s boy band debate on Thursday after the featured performer and special guest respectively reunited onstage at the "Dirty Pop at Sea" cruise, diving into a larger-than-life karaoke session that's sure to leave some nostalgic adults vindicated and others, crying over old records. Their selected song of the night? Backstreet Boys' I Want It That Way.

Being on a boat in the middle of the ocean can really do some crazy things to your band loyalty.

Watch the boys act out on their cabin fever by completely forgetting which band they used to be in below.