"Or my favourite, 'synonymous to a 1960's Mini-Skirt, short enough to be interesting but long enough to cover the essentials!' "
I first coined that in 1972 when I had to give a speech at the ULAS Annual Dinner as Senior Student....
Actually I said "A speech should be like a mini-skirt. Short enough to remain decent, yet containing much of interest!".
I vaguely recall that after a good dinner at the Piccadilly Hotel, including copious amounts of wine, then a hip flask of Glenfiddich on the bus back to THQ, followed by a few beers, I decided it would be a great idea to try Guinness for the first time. It lasted about 45 seconds, including a 30 sec gallop to trap 2 where I said goodbye to it. I've never touched it since!