I'm surprised at folks getting on the Ronnie Johns show too.
The Chopper skits are the best - especially the one where he does the weather.
Ronnie Johns' Chopper character is based on a real life underworld crime figure - Mark "Chopper" Reed. He is famous for having another inmate cut his ears off so he could get moved to a different prison
The movie that Darky mentioned is the life and times of the real Chopper and not an extended Ronnie Johns Chopper skit. The Chopper skits are full of Australian jokes and refferences to the real Chopper, so it's probably not a universal thing I guess.
Check out that movie with Eric Banner as Chopper though.