WATCH: Kenan And Kel Went Back To Good Burger For A Segment On 'The Tonight Show'

Kenan and Kel (Thompson and Mitchell, respectively) have not aged a day in the two decades since the airing of their Nickelodeon show of the same name. We know that because, this week, the beloved All That stars returned to their old digs — by which we mean Good Burger — for a special segment on The Tonight Show Starring Jimmy Fallon.

With Kel and Jimmy behind the counter, it doesn't take long before Kenan shows up. To raucous applause, the two size each other up and try not to laugh and Kel goes into the well-known Good Burger greeting: "Welcome to Good Burger, home of the Good Burger. Can I take your order?"

Keeping up with the times, Kel prefaces his order with some millennial slang. "I'm hangry — that means I'm hungry and I'm angry," he explains. "I learned that on the Internet."

Watch the Good Burger reunion below.