Then run up and do a jump punch above their head, and
immediately do a ice clone, so that if you were to uppercut
them, they would be frozen.
This might not work in the arcade, but it definitely works
on the PC version.
First, play until you get to the "Pit III" stage.
Pick Sub Zero VS. anybody.
Have the victim stand in the corner.
After it says "Finish Him", get about this far away.
Then run up and do a jump punch above their head, and
immediately do a ice clone, so that if you were to uppercut
them, they would be frozen.
Now comes the hard part. Right after the ice clone, quickly
run up and do his pit fatality, B-D-F-F-HK.
Subzero will uppercut them, and they will hit the ice clone and
be frozen.
After the ice wears off, the victim will fall a little bit....
Then the screen scrolls halfway down the pit, stops,
and Subby gets credit for the fatality.
This works on the other pits, but all they do is land and you get to watch them be dizzy. The Pit III looks best.