It's not that long ago that the Eurovision audience - largely bored local dignitaries in the host countries - were expected to sit still, keep quiet and politely applaud each miserable entry.
But ever since the Eastern Europeans started holding it in giant stadiums and cheap air travel meant fans could actually get there, the audience and its cheering and costumes and what our friends in the east brand as "exuberance" have been a big part of the show - holding up their phone torches for the middle eight of ballads, making us look like wankers by dressing in full Union Jack suits behind presenter links, and waving their flags. Their massive flags.