VIDEO : Mark Ruffalo Performs 'Achy Breaky Heart' With Billy Ray Cyrus

If you thought that Avengers: Infinity War was the craziest team-up on Mark Ruffalo's resume, he's certainly got a surprise for you. During a recent event in North Dakota, the actor and activist lent a hand to Billy Ray Cyrus in a performance of his hit song, "Achy Breaky Heart.