I remember once, a friend describing an event we’d both been at years ago: “I thought Flick was shit-faced and was about to try to send her to bed, but then I saw her take her hair down and put it back up with a hair pin and decided she couldn’t have been that drunk. Then five minutes later she tried to stand up and fell over”.

It’s very easy to do once you get the knack, but very hard to explain!