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Naturally, Jimmy Fallon is having nightmares about leaving Late Night for his new gig at the Tonight Show on NBC. In a skit on Wednesday night's show, Fallon tosses and turns in bed, calling out "Dad, Dad."

Bob Saget shows up as Danny Tanner to calm Fallon's fears in what appears to be Michelle Tanner's old room. Saget hops into bed next to Fallon to comfort him and then John Stamos (Uncle Jesse) and Dave Coulier (Uncle Joey) join.

MORE: Jay Leno looks back on 'Tonight Show'

It is a Full House reunion! Popeye and hair jokes ensue. But a more serious subject is at hand and as all you former House fans know, a life lesson is about to be learned.

"I guess I'll just miss the Late Night show. I've been doing this for five years," Fallon says. "There have been so many special moments and so many great musical guests."

Saget reminds Fallon he can make new memories at the Tonight Show even though he'll miss the memories of Late Night.

They all sing the Teddy Bear song, Elvis-style, to help Fallon go back to bed. "Goodnight, honey," Saget says.

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