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'Full House' stars soothe a worried Jimmy Fallon on 'Late Night' 

The past week or so has been a real "House" party. "Full House," that is, the '80s and '90s sitcom whose three father figures (Bob Saget, John Stamos and Dave Coulier) are having a renaissance of reunions lately, from a SuperBowl ad to a Reddit "Ask Me Anything" Q&A Wednesday and now a surprise visit to "Late Night With Jimmy Fallon."Saget, Stamos and Coulier reprised their roles as Danny, Uncle J
Image: Full House on late Night
NBCU Photo Bank

The past week or so has been a real "House" party. "Full House," that is, the '80s and '90s sitcom whose three father figures (Bob Saget, John Stamos and Dave Coulier) are having a renaissance of reunions lately, from a SuperBowl ad to a Reddit "Ask Me Anything" Q&A Wednesday and now a surprise visit to "Late Night With Jimmy Fallon."

Saget, Stamos and Coulier reprised their roles as Danny, Uncle Jesse and Joey and joined Fallon, who was decked out in his big boy jammies in bed, to kick off Wednesday night's show. But why did they need to be there? Because as Fallon admitted, he was anxious about taking over "The Tonight Show" and wanted some daddy comfort.

The men of "Full House" gave him their support. "You're going to be the host of 'The Tonight Show' on NBC," said Danny. "Honey, no one can ever take that away from you."

"Well, maybe Jay Leno," joked Jesse.

"Full House" fans had plenty to be excited about. The men were in their "Full House" costumes, including a mullet and skin-tight clothes for Jesse, and a retro sweater for Joey, a staple of his closet. Speaking of Joey, his Mr. Woodchuck also made an appearance, along with some corny jokes and impressions (his Leno is still pretty good). The guys also delivered some of the show's classic lines, including Joey's "Cut. It. Out!" and Jesse's "The hair, huh?!"

But that wasn't all. The skit wrapped with Fallon's "dads" singing Elvis' "Teddy Bear" to him, which the three men often crooned for little Michelle (Mary-Kate and Ashley Olsen) on the show.

When Fallon asked for one more round, though, they told him no.

"It's late," said Danny. "No one in their right mind is still awake."

"But it's 12:37 a.m.," protested Fallon. "That's when my show comes on."

"Exactly," said the guys.

Eagle-eyed fans were alerted to the appearance yesterday evening when Stamos tweeted a tease.

What+ever+you+do,+DO+NOT+miss+the+opening+of+@jimmyfallon+tonight!+pic.twitter.com/ydBrPYSyYT

—+John+Stamos+(@JohnStamos)+January+30,+2014+

And afterward, Coulier gave Fallon a shout-out of thanks.

Thank+you+@jimmyfallon+for+the+Mr.+Woodchuck.+You're+the+greatest+guy+I+know+-+Ranger+Joe+http://t.co/PG3u30FwnU

—+Dave+Coulier+(@DaveCoulier)+January+30,+2014+

"Full House" fans who stayed up past their bedtimes were thrilled with the reunion.

The+#FullHouse+reunion+on+#LNJF+is+all+I+ever+need.+Marathon+starts+tonight!+#unclejesse+#dannytanner+#joey+#JimmyFallon+#havemercy

—+Lisa+Murphy+(@lisaj214)+January+30,+2014+

Jimmy+Fallon's+Full+House+skit+to+open+Late+Night+was+unreal+tonight+#LateNight+#dannytanner

—+Jacqueline+Goj+(@cheekyjac)+January+30,+2014+

I+may+be+tired+tomorrow..but+so+worth+it!+@jimmyfallon:+The+cold+open+tonight+is+so+awesome.+Please+watch+it.+#dannytanner

—+Kenneth+Franzel+(@tvchips)+January+30,+2014+

TODAY's Al Roker was also impressed ... by Stamos' biceps. "The guns on Stamos ... wow!" he exclaimed after watching the clip during TODAY on Thursday.

This isn't the first "Full House" reunion on "Late Night." Stamos' band on the sitcom, Jesse and The Rippers, came together for a performance in July. Lori Loughlin, who played Jesse's wife Becky, also made an appearance to support her TV hubby.

"The Tonight Show" returns to New York City with Fallon as host on Feb. 17.