Jack Grealish is having the best week of his life. Of course he is – he’s just won the treble with Manchester City (the Champions League, the Premier League and the FA Cup), and only one other English football team has ever done that. But this isn’t just anybody having the best week of their life – it’s Jacko. To put it in context, every week is a good week for Grealish. He is the optimist’s optimist, the hedonist’s hedonist, the party animal’s party animal. And this is his time. In years to come, this behaviour will become known as doing a Jack. There may well be a four-day festival named after him – Grealishbury? Jackstock? – where revellers have pricey vodka poured down their throat as they “do the turkey”.