When I was wandering the streets of Jakarta, camera in hand, a bus went by and stopped at a red light. A bunk of punks popped out yelling "Hey Mister, take our photo!" - so I ran into the street and snapped a single photo before the light changed and I had to dodge out of traffic. This single, glorious photo was waiting for me when I went to review my photos, and it one of my absolute favorites.
I played with different color and exposure aspects in editing, but black and white made it pop, and many more details could be seen.
Digital photo, taken with a Canon MK4 and 28-105mm f/4 lens.