Backwards Scene was a game played on the British edition of Whose Line, and twice on the American version.
As the name suggests, it was a straight scene-improvisation game with the catch that it was played backwards - starting with the last line and going to the first. The audience was sometimes required to determine the first line, in order to provide an end-point for the scene.
The game was particularly taxing on the performers, but was generally played in good spirits. One memorable rendition involved Brad Sherwood, Colin Mochrie and Ryan Stiles in a bar-room brawl. Colin began the scene "dead", before getting up and running around shouting "you couldn't shoot me if you tried. At another point in the scene, Brad and Ryan continually tried to force the other to tell a joke backwards.