The motorbike is a prevalent form of transportation in any developing country. Often times in Cambodia, I would see 3 or 4 or even 5 people on a motorbike at once. Entire families! It was impressive to see in motion, but even stationary, they sometimes find a way to impress.
One of the many little scenes you can see play out if you just take the time to walk around and explore a city on foot. While there are plenty of impressive temple ruins, equally impressive are the people that make up the city of Phnom Penh.