Two years ago, FA Cup Final day, I went for 70 km ride in the morning (train back, so as to get back for the footy).
The day started warm, but before long it was wet and cold and I was totally unprepared. After 60 km I bonked very badly, and as soon as I saw a petrol station, I stuffed myself with (literally) a cocktail of hot dogs, coca cola, pastries and chocolate (stuff that I don't normally eat).