Watch The Rock slay 'Shake It Off' in the first episode of 'Lip Sync Battle'

The first rule of Lip Sync Battle: You do not challenge The Rock.

On last night's season premiere of the Tonight Show spin-off, Jimmy Fallon brought out The Rock for a battle. Big mistake.



Middle fingers were thrown, dirt was brushed off shoulders and an instant classic was born.



If this isn't the best thing you watch all morning, we can't help you (contains a certain NSFW gesture).