Two:
1) My hair is fine and curly. At 18 I wanted to see what it would be like to have straight hair without having to blow it out. The hairdresser picked out what he thought was a weak solution. He put it in, rinsed it out, gave me a blow dry and sent me on my way. I looked fine. My hair was bone straight, even after washing and air drying.
About a month later, when about an inch of new growth came in, my hair snapped off at the crown. Just at the crown. The rest of my hair stayed long. You can well imagine my shrieking and sobbing. I went to see him and made him refund my money. I had to wear a high pony tail for almost 2 years, until my hair was long enough to cut evenly to an above the shoulder length.
2) I went to a different hairdresser a few years later to get my hair colored a deep auburn. She put in a bleach, unbeknownst to me, and walked away to chat on the phone. About half an hour later, she rinsed it out and I was platinum blonde. My skin is about the same color as Tina Knowles’, to give you an idea of just how wrong I looked. My (naturally blond) BF at the time took one look and collapsed into laughter. He had to leave the salon, that’s how hard he was laughing. I was not charged and the stylist fixed it, but I’ll never forget the looks of the other patrons when they saw my hair unveiled. Bug-eyed to a woman.