Conan O'Brien had quite the reunion with an old friend on Wednesday night.

Making a surprise appearance on Late Night with Jimmy Fallon, O'Brien dropped by 30 Rock to pick up Triumph the Insult Comic Dog.

During O'Brien's 16 years at NBC as host of Late Night with Conan O'Brien, the puppet often interviewed celebrities while puffing away on a fake cigar. Triumph even made it to mainstream music, appearing in a music video for a 2004 Eminem song.

After just seven months of hosting The Tonight Show with Conan O'Brien, the 48-year-old funnyman and NBC failed to negotiate a workable timeslot to boost ratings. On Jan. 22, 2010, O'Brien hosted his last episode of The Tonight Show, with the support of friends like Tom Hanks, Steve Carell and Will Ferrell.

O'Brien later embarked on a Legally Prohibited from Being Funny on Television Tour across North America before TBS offered him hosting duties of a brand new late night show simply titled Conan.

At his old stomping grounds on Wednesday night, O'Brien was greeted with a standing ovation and cheers.

You know, I was back in New York and I decided to come by, check out my old studio, O'Brien told Fallon.

I came by for a reason . . . I left something here, something important to me. And I haven't had it in a while and I thought, since I'm here in my old studio, I'm gonna get it back, O'Brien added, before retrieving Triumph from the couch.

O'Brien of course did not mention Triumph's name on the air.

When he parted ways with NBC, the studio retained ownership of all characters and storylines O'Brien created during his time with Late Night, MSNBC reports.

Since debuting on Nov. 10, 2010, Conan has remained one of the strongest programs on TBS. In June, Conan ranked fourth in the late-night cable talk show category, right behind The Daily Show, The Colbert Report and Chelsea, according to a report from AdWeek.

Scroll down to watch O'Brien's reunion with Triumph the Insult Comic Dog.