Adam Horovitz, aka Beastie Boys' Ad-Rock, stars in Noah Baumbach's new film While We're Young. He stopped by "The Tonight Show Starring Jimmy Fallon" to talk about the movie, but mostly, he stared into the studio monitors and talked about his appearance. "Man, I should've shaved or something," he said. "I'm wearing a dirty shirt? I should've wore a hat. I've got a big forehead!"

He also talked about the Beastie Boys opening for Madonna. Spoiler: Madonna audiences in the 1980s did not care for the Beastie Boys.

Later, he appeared in a segment (with a hat on!) featuring Jeremy Wade from the Animal Planet series "River Monsters". Fallon and guest Will Forte both handled some strange fish. When Fallon asked Horovitz if he'd like a turn, he declined. "Nah, I'm good."

Interview:

Jeremy Wade segment: