The morning of the 1967 cup final saw my conversion, aged 7.
Nothing to do with silky skills, glorious football etc.
Simply I was showing distressing signs of becoming a Chelsea supporter (I knew the names of a few of their players). My father explained that supporting Spurs was a family thing and that I had no choice in the matter and that to support anyone else was regarded as high treason within our family.
At the age of 7 I suppose this sort of an arranged marriage and emotional blackmail was a little unfair but at least it saved me from the purgatory of becoming a Chelsea fan or worse!