We never doubted that Matt Damon is a talented guy, but beatboxing ... who knew? The Oscar-winning actor proved he's full of surprises in an appearance on The Late Late Show with James Corden Thursday night. Damon and the star of The Lego Batman Movie, Will Arnett, stopped by for a visit with the host when the topic of Arnett's beatboxing skills came up.

"Are you any good at beat boxing?" Corden asked, referring to his beat boxing moments from The Lego Batman Movie.

"Yeah, I'm the best."

From there, with the help of musician Reggie Watts, Corden set out to test his skills. "Matt and I will just join in wherever we can," he said as Watts took the lead.

Things start out a bit rocky at first, but once the guys find their groove, they really take off. Honestly, we're seriously impressed.

During the actors' visit, Corden also steered the conversation towards more important topics, like Damon's favorite Batman: his BFF Ben Affleck, or Arnett.

"Well, look, I have it on good authority that Will is actually Ben's favorite Batman," he replied, expertly dodging the question.

Damon went on to say that Affleck took his role as Batman very seriously, in large part due to the fact that his 4-year-old son Sam, really believes he is Batman. And when Sam became convinced that the FedEx deliveryman was the Joker, Affleck had no choice but to take things to the next level.

"Ben is literally on a first name basis with this guy, because he went out on the first day and was like 'I'll give you 20 bucks if we pretend to fight because my kid thinks you're the joker.' So he has to send him away every day," Damon revealed as the other men hunched over with laughter.

How cute is that?