As always, Google Video turns up some neat things, and the latest of these is a vid of Street Fighter II's M. Bison blasting his way through Super Mario Bros - or at least, a faked-up World 1.1 of the NES classic.

As for what manner of technical background underlies this arch fakery, the description reads: " NES Super Mario Bros. - Using M.Bison's ultimate Psycho Crusher, for the ultimate win! Credit goes to Bane84 for the NES Super Mario Bros. World 1-1 bonus stage for MUGEN. Thanks, Bane84!" Aha!

[For those who don't know, MUGEN is "a 2D fighting game engine designed by Elecbyte starting in 1999... The engine allows for anyone to create characters, stages, and other game objects through interpreted text files and graphics and sound compilations, and it also supports MP3 background music during gameplay." The MUGEN scene is pretty fascinating, and rarely explored - anyone got any tips on where to start?]