I went out on a night shoot with a class from our school. (I manage a photography school, in case you were wondering.) We stayed out until about 2:30 in the morning shooting in the lower downtown area of Denver. The highlight was probably when we were at confluence park and some young folks (20ish) rode up on their bikes and proceeded to go skinny dipping in the artificial rapids outside of the REI store. They consented to having their pictures taken and I got a couple of fun shots as they were riding the rapids. I was shooting Tmax 100 and using very long exposures, so I illuminated the swimmers with a hand held flash. The result was really ghostly and cool.
All in all a great evening of shooting!