By Adele Hampton - 07/11/13 12:49 PM EDT
"It got even weirder when Biden said, 'For me, it's crayons,'" he added.
"Tonight Show" host Jay Leno threw in some science in his opening monologue, saying researchers have concluded that life on Earth is wiped out every 27 million years, giving us only 16 million years left — "just when the deficit is scheduled to be paid off."
Fallon wrapped up his opening speech with news that outspoken rock star Ted Nugent, known for his music and controversial political views, is thinking about running for president.
"Nugent said it's always been his dream," Fallon quipped. "And then Democrats said: 'Ours too.'"