When people argue about Carbonated substance names or tastes.
Ex 1: Jim and Mark argue about Dr. Pepper and Mountain Dew, which one tasting better, until Mark bashes Jim's head in and yells "EXTREME" as he drinks his dew. Then they turn off the Xbox and go to their mommies. Then they resume their Carbument.
Ex 2: Jim and Mark argue about whether Soda or Pop is the correct term for cola until Mark bashes Jim's head in and gets put to death since he's in Texas which is in the area people say soda.