Youtube doesn't work on my work computer, but there was a scene in a Japanese film I watched a while back (think it might have been called "Dead or Alive", but not sure).
The whole film was basically about this cop going after some gangsta bloke, and it increasingly escalating into a personal war between the two.
So anyway, in the final scene, they were both in cars playing chicken, and rammed into each other. The gangsta guy crawled out of the wreckage, with his arm dangling off, then bent over and suddenly pulled a rocket launcher from behind his back, and fired it at the cop guy. In response, the cop guy caughed up a beam of energy and used it to destroy the entire world. Then the film ended.