Admiring his new mustache, Fallon said, "I don't mind it. I think I can pull it off. This is good." Adding that he feels "like a million bucks," he told his audience, "This is it. This is the new me."

Before Fallon's shave, he interviewed Cordeiro and One Thousand Mustaches author Allan Peterkin. After a brief history lesson, he showed them a yearbook photo in which he had a bit of fuzz above his lip. "This is me in high school," he explained. "That's kind of something, right?"

Peterkin would call it "the teen 'stache."

"It was very wispy," Fallon recalled, "and if the wind blew, it would just fly everywhere."

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