Jack Black Plays His Legendary Sax-A-Boom In Greatest Tonight Show Gag Ever

One of the most memorable moments on The Tonight Show Starring Jimmy Fallon featured Jack Black and his legendary Sax-A-Boom, a plastic children’s toy that he’s made famous through his live performances. Fallon, always full of clever ideas, asked Black for a demonstration, and what followed was pure comedic genius.

With a series of hilarious quips, Black explained that while many confuse a saxophone with his beloved Sax-A-Boom, the latter is an entirely unique instrument—one that supposedly takes years to master. When Fallon revealed that a Sax-A-Boom was already on the set, Black took it as if it were a rare treasure—comparing it to a Stradivarius—and promised to give Fallon, and the audience, a special taste of its magic.

What followed was nothing short of a master class in comedic timing. Black began jamming on the Sax-A-Boom, pressing buttons that triggered pre-recorded sax melodies, yet he played them with the flair and passion of a seasoned virtuoso. His expressive facial gestures and rhythmic dancing had the entire audience cheering and clapping along.

Not content with just his solo act, Black then joined forces with The Roots. Bandleader and drummer Questlove quickly set a funky groove as Black and Fallon danced together, creating a performance that has since become a classic—amassing 95 million views and securing a spot as one of the most popular videos on The Tonight Show’s YouTube channel. This moment complemented other unforgettable late-night antics, such as his memorable guitar battle with Conan O’Brien.

Over the years, Black’s repeated use of the Sax-A-Boom during Tenacious D shows has turned the once-discontinued toy, originally sold for $20 in the late 1990s, into a coveted collector’s item, sometimes fetching $50 or even $100 on auction sites.

For more hilarious moments and a deeper dive into his unmatched comedic talent, check out Jack Black’s YouTube channel or follow him on Instagram—there’s always another surprise waiting from this rock ‘n’ roll comedian who turns every performance into a celebration of laughter and creativity.