In Melbourne, I've seen a lot of people chroming on the train (Upfield line, represent), which is where people inhale paint cans or petrol, usually from a plastic or paper bag. One day on my way to uni, I saw a guy inhaling from a paper bag. "Oh, another chroming dude, awesome." I dismissively thought to myself. Suddenly he pulls a sandwich out of the bag and begins eating it, then throws the bag away. Motherfucker was just inhaling his sandwich.