The Star-Spangled Banner by Roseanne Barr (1990)

On July 25, 1990, Barr performed "The Star-Spangled Banner" off-key before a baseball game between the San Diego Padres and Cincinnati Reds at Jack Murphy Stadium.[76] She later said she was singing as loudly as possible to hear herself over the public-address system, so her rendition of the song sounded "screechy". Following her rendition, she mimicked the often-seen actions of players by spitting and grabbing her crotch as if adjusting a protective cup. Barr later said that the Padres had suggested she "bring humor to the song", but many criticized the performance, including then President George H. W. Bush, who called her rendition "disgraceful".[77][78]

Source: Wikipedia