There's a video version of "Bang Bang", sung by Nancy Sinatra. She sings the song while lying/sitting on stage. At the end, she rolls off the stage.
It looks like it may have been for a live-in-studio pop/rock show.
What was the reason for her rolling off the stage? It's very awkward and detracts from the otherwise serene and seductive nature of the song. Did she ever discuss it in an interview?
Note: updated video link to an active version.
Update: It's possible this performance is from 1966, and from "Frank Sinatra’s special A Man And His Music, Part II".
During the 1966 broadcast of Frank Sinatra’s special A Man And His Music, Part II, later issued to VHS and DVD, Nancy Sinatra gathered her wits and launched into a even-keeled, brittle and truly remarkable performance. Her voice goes down smooth, as you’d come to expect from her by then, and backed only with Strange’s measured but loose guitar playing, “Bang Bang” emerges as the timeless classic it was always meant to become.
(The video link in that source is the original link I posted here, now dead.)