Here's some easy math for you: Jimmy Fallon + Justin Timberlake = X.

In case you've been living under a rock for the past year and last night when Justin appeared on "The Tonight Show" ... X = COMEDY GOLD.

Jimmy and Justin followed up their "History of Rap" and "#Hashtag" skits with another amazing comedic sketch. For their latest skit together, the two return to Camp Winnipesaukee as teens circa 1997, as they annoy their Camp Counselor by loudly singing and rocking out to Third Eye Blind's "Jumper" after lights out!

Watch Jimmy and Justin get into trouble at Camp Winnipesaukee below!