Justin Timberlake made a surprise appearance on The Tonight Show Starring Jimmy Fallon on Tuesday night . . . or should we say a surprise appearance in Camp Winnipesaukee? The singer and good friend of Jimmy showed up for a hilarious skit that harks all the way back to the days of sleepaway camp in the '90s, complete with CD players, Third Eye Blind, and Kimmy Gibbler. It's even funnier than their last camp sketch, where they sang an entirely different '90s hit. (It was Hootie & the Blowfish's "Only Wanna Be With You.") Watch the hilarious video above, which showcases what sleepovers with Jimmy and Justin are probably like to this day, and don't forget to check out all of our other viral videos.