Wolf Blitzer joined Jimmy Fallon onstage at George Washington University this weekend for a performance of "Balls In Your Mouth."
Fallon wrote the song about the oil spill in an apparent reference to tar balls, and it includes lines like, "Balls in your mouth, balls in your mouth, for swimming in the ocean, you'll get balls in your mouth."
Fallon was appearing at GW as part of its Colonials Weekend, and invited Blitzer (who was innocently in the audience) up on stage to perform with him.
"I had no idea Jimmy was going to invite me on the stage," Blitzer told Politico's Click. "I was just sitting in the audience. It was totally impromptu. He's a very funny and talented guy and it was fun for me to be on the stage next to him. And I really enjoyed his performance."WATCH: