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 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,

Black's entrance and wardrobe malfunction were highlighted on The Tonight Show's Instagram page. The actor made his way from the back of the auditorium, through the audience, to Fallon's desk while delivering an enthusiastic guitar solo.

The actors appeared in a video segment in a break from shooting in Australia as they introduced Sony film chief Tom Rothman.

Jack Black is hosting “Saturday Night Live” for the first time in nearly 20 years on April 5 — and it’s keeping him up at night. The actor, comedian and musician made a stop in London on Sunday for the premiere of “A Minecraft Movie” before heading into the “SNL” writer’s room this week,

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

During the game, Melvin asked Black to either confirm or deny that a sequel was coming out for one of his popular movies. While he said that it's "not likely" for "School of Rock" to return, he did tell his fans they should get their hopes up for "Jumanji 4."