Summer camp never looked so good!

Justin Timberlake and Jimmy Fallon zoomed back in time on Tuesday, Dec. 16’s Tonight Show, to their days as sleep resistant teens, having fun after lights out at summer camp!

The duo sported braces on their teeth and retro hairdos as they played the roles of two young boys on the cusp of puberty (Timberlake and his full beard being slightly ahead of  baby faced Fallon), trying to get to sleep at Camp Winnipesaukee.

Turning on their torches, Fallon is first to appear from under his bed clothes, asking the former 'N Sync hunk if he's asleep. "No," he replies, emerging from his spaceship comforter, to rapturous audience applause.

"You want to play truth or dare?" a cheeky Fallon asks. Timberlake, the slightly more worldly of the two, is eager, but concerned. "Yeah! Is it weird it's just two boys?" he asks his buddy.

Timberlake proceeds to admit his crush (Kimmy Gibbler from Full House!) before the two boys indulge in a completely classic sing-along with their favorite song — "Jumper" by Third Eye Blind.

Watch the whole hilarious sketch above, and hold out to the end to see the boys promise to be best friends forever — just, ahhh!