Jimmy Fallon enrolled in Bayside High on Wednesday's The Tonight Show.

Naturally, his best friends Zack (Mark-Paul Gosselaar), Kelly (Tiffani-Amber Thiessen), Slater (Mario Lopez) and Jessie (Elizabeth Berkley) were there, as was Mr. Belding (Dennis Haskins).

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Fallon flash backed to the day he told his pals he was moving to New York to hopefully become a comedian, Saturday Night Live castmember and maybe even date Nicole Kidman (a joke about the recent revelation that he had a shot with her back in the day).

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"Jimmy going on a date with Nicole Kidman is like Jessie becoming a stripper," said Zack. (Google Showgirls if you don't get that joke.)

Fallon, who has tried to stage a Saved by the Bell reunion since his Late Night days, had no luck getting Screech (Dustin Diamond) and Lisa (Lark Voorhies). In 2009, Gosselaar appeared on Late Night in character as Zack. Fallon staged his reunion during his weeklong residency in Los Angeles.

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Email: Aaron.Couch@THR.com

Twitter: @AaronCouch