Somehow a fully grown adult doing tricks on a tiny bike is one of the coolest things going.
Fun fact: BMX racing heats last about 30 to 40 seconds, making it one of the shortest Olympic events.
Heath Ledger turned up, did that, and now every comic book villain is just trying to keep up.
Fun fact: "Heath Ledger locked himself in a hotel room for six weeks to develop the Joker's voice and mannerisms."