Some guys decided to find out what would happen when you threw slices of processed cheese onto a still-smouldering braai (or barbecue for you non-south africans). Turns out, the plastic doesn’t melt into a gooey, toxic mess, but actually expands, boiling the cheese inside. How is it racing? Well, you and a couple of (allegedly preferably drunk) mates get together, each with their own slice of cheese, and lob them onto the grill. Whoever’s bag of cheese expands first is the winner.
Some people will do anything for entertainment!