Are Jesse and the Rippers making a comeback?

John Stamos posted an awesome video on Instagram yesterday, showing him and two other men singing the theme song for "Full House."

Sadly, the clip is only about 20 seconds long, meaning we don't get the whole song ... just yet.

"Never thought I'd be singing THIS song," the 49-year-old tweeted along with the video.

Stamos and his TV band will reunite on "Late Night with Jimmy Fallon" this Friday -- and we can't wait to see the performance.

Have mercy, indeed!

Check out the gallery above to see how all the stars of the entire TGIF lineup have aged through the years. Which show was your favorite?


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