As Pep Guardiola walks out at Wembley on Saturday, he does not know what version of Manchester City will turn up. And that's a horrible position to be in as a manager.
When I was covering the FA Cup as a TV pundit, Manchester City were playing League One Wigan Athletic in the fifth round in 2018. I remember saying, listen, City won't lose today because they have suffered a cup upset before against Wigan, when they lost the final in 2013. Their cage had already been rattled. But City lost again, and it proved that lightning could strike twice.