Jimmy Fallon surprised his audience on Tuesday night when he welcomed Jay Leno back to The Tonight Show in a surprise appearance.

Fallon started the show as usual–easing into his monologue. Then he suffered some sort of “injury.”

“I think I pulled a hammie on that one. I don’t think I can continue,” Jimmy Fallon said. “I think I’m going to have to sub out. Can someone tag in for me please?”

That’s when longtime Tonight Show host Jay Leno took the stage to thundering applause. He took over Jimmy Fallon’s monologue, immediately launching into several one-liners about presidential candidates.

.@jayleno takes over @jimmyfallon's monologue like only the former "Tonight Show" host can: http://t.co/2xe1CIIA05 pic.twitter.com/6N1JRc61SD

— TheBlaze (@theblaze) October 7, 2015

“You know, a lot of people think that when the Republican feud begins to clear, it’ll be between Jeb Bush and Donald Trump–kind of like the race between the tortoise and the bad ‘hair.’”

Leno made sure to poke fun at Hillary Clinton and Bernie Sanders, too, during the monologue.

Jimmy Fallon rejoined Jay Leno on stage when he started mocking the state of the economy.

“(The economy) is so bad even the Kardashians are losing their ass!” Jay Leno cracked.

“How bad is it?” the Roots replied.

“The economy is so bad Hillary Clinton wants people to look through her deleted e-mails to see if there’s anything from that Nigerian prince,” Jimmy Fallon added.

Did you catch Jay Leno when he appeared on The Tonight Show With Jimmy Fallon on Tuesday night?

Leno is promoting his new CNBC show Jay Leno’s Garage, and in doing so is making the rounds of daytime talk shows in addition to his stop at The Tonight Show. Fans were no doubt thrilled to see him back–if only for a short visit.