I had my Vincent Tan moment as a 6 year old in 1971 when promotion chasing City lost at home 0-2 to fourth division Brentford in the F A Cup. It just didn't seem possible to me that a class team like the Bluebirds could lose to a side two divisions lower. Once I got to grips with it though it sort of set my default pessimism level at the necessary level for the 47 years to date.