South Park "Cripple Fight". Inspiration?

I was watching a Simpsons re-run today where Marge beat the crap out of her mugger, a-la Sonny Corleone. That reminded me of the South Park episode that featured the “cripple fight” between Timmy and (I forget his name). Anyway, I thought I heard once that it’s based on a fight from a movie or TV show. Anyone know?

It is inspired (copied) from the movie They Live by John Carpenter.

They Live.

I haven’t seen that movie in a long time, but the South Park fight is supposed to be nearly frame for frame identical.

The other crippled kid is Jimmy.

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