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Justin Timberlake and Jimmy Fallon Best Friends Challenge

Watch Justin Timberlake and Jimmy Fallon Sing About Poop on The Tonight Show

Justin Timberlake and Jimmy Fallon put their friendship to the ultimate test on The Tonight Show on Wednesday. After making us laugh during their hilarious Camp Winnipesaukee skit, the fun continued as the two took turns drawing questions from the Best Friends Box and tried to guess each other's answers. Aside from making everyone feel like a third wheel with their inside jokes, they proved that their bromance is the real deal as they answered almost every question correctly. Of course, the best part comes at the end when they simultaneously start singing about poop.

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