Wear slightly faded and creased clothes.
Do not swim off the back of the boat in crowded anchorages esp. in the morning.
Do not fly several assorted pennants, pirate flags and obscure club flags from the spreaders.
Get to your chosen harbour early enough to make popcorn and enjoy the evening 'charge of the charter boats' giving marks for style, technical merit and entertainment value on their anchoring/mooring techniques. [ there is a youtube video clip of an excellent example of the best of the above which I can not locate..]
Perhaps this is the one you were thinking of
YouTube - "Ode to the Credit Card Captains"