Thought I would briefly (and carefully) return to this thread, as I do not want to come across as arrogant and unreflective. I have hardly any experience of teaching compared to 95% of the people on this board and my practice is currently a work in progress. On the other hand, I have worked in business for over 20 years and managed and motivated people in a tough environment. I never compromised what I thought of as good practice in my previous career, even though I at times paid for it in terms of money and promotion.
I would obviously not show a media clip during an observation and, by the same light, I would try to demonstrate my best teaching. What I meant above is that I would not suddenly do a whizz bang lesson with 10 'episodes' squeezed into 50 minutes, and weird kinaesthetic activities which, in my opinion, would add nothing to my teaching. If the observer was looking for that, then they would be disappointed.
I am going into teaching because I feel I have a knowledge and enthusiasm for my subject which I want to communicate, as best I can. Ultimately, I want the pupils to do their best when I teach them, not some inspector to enjoy the trendiness of my lesson. I believe inspections (as some have said above) are moving in that direction. On the other hand, other posts above seem to show that there is some residual tendency to look for the 'outstanding' single lesson and to unfairly pressurise teachers who fail to deliver it.
Again, as I said above, once I get to the point that I am going in to a school to go through the motions, frightened of what some observer might say, then it will cease to be what I want to do. I am certainly not doing it for the money!