While visiting a nightclub in Tokyo, Japan, Led Zeppelin drummer John Bonham asked the DJ to play some of the band's music. The DJ, whose booth was in a cage which went up and down like an elevator, refused. Bonham promptly unzipped his pants and took aim...
[On another occasion, Bonham grew annoyed with Jimmy Page's Japanese girlfriend -- and defecated in her purse.]
Sources
M. Moser, Rock Stars Do the Dumbest Things