Spiders - my first memory is waking up to find a huge one on my pillow. I was terrified of them until I had my own children, and was determined not to pass my fear onto them, so went to an open day at our local vet with my daughter and we both held a tarantula!
Smoking - I hated the fact that my parents smoked and still detest smoking almost to the point of phobia.
Sunday School - although my father was an agnostic and refused to have me baptised, he did allow my granny to take me to Sunday School each week. I loathed it and couldn't understand why I wasn't allowed to question anything and had to "believe". Even as a child, my logical brain couldn't entertain the fantasy of religion...
Cruelty to animals - I even refused to go to circuses as I knew, deep down, that it was wrong to make animals do those kind of things. I once spoke up when I saw a woman hitting her dog - well, she only went and told my mum, and I got hell from her for daring to speak to an adult like that (that still smarts, even to this day!).