Jack Black experienced a slight wardrobe malfunction during his Monday appearance on “The Tonight Show Starring Jimmy Fallon.” The actor, 55, came out while playing on an electric guitar, but as he danced up the steps his pants fell around his ankles, showing off his black and red boxers.

Jack Black gave The Tonight Show audience much more than they bargained for on Monday (March 31) evening as he flaunted his multi-colored underwear while greeting host Jimmy Fallon. Black arrived fully clothed in a colorful button-down and black pants as he shredded a Minecraft guitar while walking through the audience and to the Tonight Show stage to promote A Minecraft Movie,

The star of “A Minecraft Movie” made an appearance on “The Tonight Show Starring Jimmy Fallon” Monday night, where he played an energetic guitar solo to the crowd and lost his pants in the process, revealing his red and black boxers. Black pulled his pants back up and Fallon told the actor he was bringing “the heat” to the set.

Jack Black had a hilarious moment on the stage of "The Tonight Show." The Tenacious D star ran into a problem with his pants that fell down by themselves during his triumphant entrance on the show.

Jack Black bounced back from a major wardrobe malfunction like a rockstar. The School of Rock actor, 55, entered through the audience during his Monday, March 31, Tonight Show Starring Jimmy Fallonappearance,

Jack Black, who will next be seen playing a role in A Minecraft Movie, had a hilarious malfunction moment on Jimmy Fallon's The Tonight Show.

During Monday's appearance on The Tonight Show with Jimmy Fallon, Jack Black experienced a wardrobe malfunction but took it in stride.

The “Minecraft Movie” star was unfazed as his pants fell to his feet as he announced he forgot to bring a belt.