My mother and brother had been insisting that I would look great with curly hair and finally (when I was 13) talked me into getting a perm. Whilst it was being done, I felt really ill due to the smell of the chemicals, and ended up with chemical burns on my forehead. Also, a week later it had all fallen out and my hair was dead straight again.
I was never happy with blonde hair, and always wanted black hair ... but knew it wouldn't suit my complexion. As a teenager, I finally decided to dye my hair brown, so went to the chemist and asked for assistance. The lady at the chemist picked out a packet labelled "chestnut brown" and the picture on it looked great. She also told me that if I didn't like it, then I could just wash my hair a dozen times and it would come right out.
So I took it home and followed the directions ... and my hair turned bright crimson - obviously not a natural colour at all.
My mother fixed it by getting me to put two bottles of "medium ash brown" on top, which toned it back to a more acceptable auburn. I had to repeat dying with the medium ash brown every month until two years later it had grown out enough that I could get it cut off. (So much for being able to wash it out if I didn't like it.)