"Bück dich" (German: [ˈbʏk ˌdɪç], lit.
'Bend Down' or 'Bend Over') is a song by the Neue Deutsche Härte band Rammstein that first appeared on their second studio album, Sehnsucht, and as one of the B-sides to the CD version of "Du hast".
When performing it live, vocalist Till Lindemann has simulated anal sex with keyboardist Christian Lorenz using a water-squirting dildo.
[1] Due to the controversial nature of the act, Lindemann and Lorenz were both arrested after a concert held on June 5, 1999 in Worcester, Massachusetts.
Consequently, three versions of Rammstein's Live aus Berlin were released - one VHS including "Bück dich", another VHS and DVD without it and the uncensored DVD including the song.