First it was when Dezi Arnaz (from I love lucy) demonstrated to studio bosses that they could make more money for themselves by repeating programmes ad nauseum. It was a new concept then.
Then there was the moment when Bobby Ewing stepped out of the shower cubicle to find that all fhe events of the past 6 months had only been a dream. In that moment TV irretrievably moved from the sublime to the ridiculous.
And finally, most recently, it was the moment when the music industry rea;lised that they could sell soft porn videos on the back of their record releases.