Drinking the milk is an open wheel thing............throwing your gatorade bottle is a NASCAR thing!!
Actually, the Brickyard is way less of a tradition in stock cars. They ain't even been racing there that long. I'm not sure by any means but I think it's about 15 years. The track was built for light cars with big, big tires.......flat and almost perfectly symetrical!! It's a challenge to get a stock car around it fast......which makes it a fun race to watch. But, it just ain't the biggest NASCAR race..........never will be either.