Mr. Bungle is an American experimental rock band formed in Eureka, California, in 1985. Having gone through many incarnations throughout its career, the band is best known for its experimental rock period. During this time, it developed a highly eclectic style, cycling through several musical genres, often within the course of a single song, including heavy metal, avant-garde jazz, ska, disco, and funk, further enhanced by lead vocalist Mike Patton's versatile singing style. This period also saw the band utilizing unconventional song structures and samples; playing a wide array of instruments; dressing up in masks, jumpsuits, and other costumes; and performing a diverse selection of cover songs during live performances.
The band was founded as a death and thrash metal project while the members were in high school. It is named after a character in the 1960 children's educational film Beginning Responsibility: Lunchroom Manners, as featured in the 1981 HBO special The Pee-wee Herman Show. Mr. Bungle released four demo tapes between 1986 to 1989. On the back of Patton's success as frontman of Faith No More, it signed to Warner Bros.