This is such FUN! Jimmy Fallon challenged Tonight Show guests Kelly Clarkson, Shaquille O'Neal, John Oliver, Rachel Brosnahan, Mumford & Sons, Meghan Trainor, Anthony Anderson and The Roots to sing Kelly's "Since U Been Gone."
Appearance order: (0:03) - Kelly Clarkson (0:11) - Shaquille O'Neal (0:18) - Jimmy Fallon (0:22) - Rachel Brosnahan (0:25) - John Oliver (0:28) - The Roots (0:35) - Meghan Trainor (0:40) - Mumford & Sons (1:04) - Anthony Anderson
You can't help but smile and laugh with this!