It's a ballsy game, and Cena wants you to know he's "all balls".
This really is more a game that will appeal to those with a mental age of between 8 and 10, but we're willing to forgive it thanks to Cena's comedy chops which he first displayed in Amy Schumer's 'Trainwreck' and does so again here with Fallon. We've a feeling you can expect to see him hosting SNL any week now.
Also, fair balls (pun intended) to Fallon. If John Cena got all up in our face like that, we'd have done a runner.