Watch Justin Timberlake and Jimmy Fallon Sing Third Eye Blind at Summer Camp

Tonight Show Justin Timberlake Still - H 2014

If you miss the band Third Eye Blind, you can rest assured that you're not alone. 

Justin Timberlake joined Jimmy Fallon on Tuesday's Tonight Show, where the two frequent collaborators played orthodontia-wearing youngsters at summer camp.

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The two guys can't stop belting out Third Eye Blind's hit "Jumper," even though they know that singing out loud will lead to a very strange punishment. 

Timberlake's character also explains why he suddenly has a full beard — and he discusses his hair in other areas of his body as well.

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Watch the full video below, but don't blame us if the tune gets stuck in your head for the rest of the week.