Fans of Jimmy Fallon will know that many of his biggest stunts are usually set up, although he tries to make them look spontaneous.
Despite it being incredibly obvious, they're always still funny.
This one shows Fallon challenging 'Taken' star Liam Neeson to an arm wrestle, during which both recite the hilarious things they plan on doing when they win.
The result is an oddly terrifying but also hilarious grudge match.