Jimmy Fallon and Russell Crowe Honor Earth Day by Singing "Balls in Your Mouth"

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Russell Crowe stopped by The Tonight Show Starring Jimmy Fallon on Wednesday, and the two sang a hilarious duet in honor of Earth Day. After Jimmy somberly reminded the actor that April 22 marked the five-year anniversary of the BP oil spill that left tar balls all over the sea, the two expressed their emotions through song. Jimmy and Russell both grabbed guitars and gave a heartfelt performance of "Balls in Your Mouth." The two went into the audience and, after repeating the chorus of "if you swim in the ocean, you'll get balls in your mouth," started a sing-along. Watch the funny clip above, then watch Jimmy make Blake Lively laugh so hard, she snorts!