Controlling a difficult prospect

As the sales engineering part of a sales team...I was setting up an on-site demo in the office of a very busy manager. I was told by the salesman that the manager was in high demand...never sat still ...and was always taking calls in the middle of appointments. I looked at the physical layout of the office and came up with this plan. I set up the demo equipment on the coffee table in front of a couch in his office. After the prospect came in and sat on the couch facing the demo...the sales person pulled up a chair on his left and I pulled up a chair on his right...so...he had no way to easily leave the couch. As we started the demo...a secretary announced a new call on the phone on his desk. He sprang up...stepped over the coffee table...walked to his desk and took the call. When he returned to the couch...we started again...and another call was announced...he started to get up and step over the table again...but stopped...he said to the secretary..."hold my calls" and sat back down. We proceeded to get him involved in the demo which lasted over two hours! Then he called the rest of his staff in and said..."you have got to see this system"! What we did was make it too inconvenient for him to escape from the demo. He purchased the system...and it was partly due to to the fact that we recognized a potential problem...getting and holding his attention...and creatively solved it. Excellent Selling!