I received a call from a client in Philadelphia, PA who needed a few photographs of their client for a marketing brochure they were developing. Their client's offices were in Dulles, VA. They needed the photographs within 48 hours and the client only had about 45 minutes to give me to take the photographs. Other than that it was easy. So I showed up and scoped out the building to get some ideas, the client (four people) showed up on time at 9AM and we started. We were done by 9:45AM and everyone was able to get back to work.
I sent the photos to my client later that afternoon. They were VERY pleased. It can be nerve racking walking into an unknown environment and having to come out with first class, professional photographs with little time, but I also find I thrive under those conditions and produce some of my best work.