Once or twice, but normally I was the "golden child" of the family so it didn't happen often. It didn't leave that much of an effect on me so it was a fairly useless form of punishment. Once, though, I made the mistake of swearing in front of my dad. He washed my mouth out with soap. It was disgusting and has forever made me avoid using such language.
He told me many years later that he regretted doing it, though, and for my younger siblings he used different disciplinary techniques.
My mom is not a good reasoning person to ask why she spanked me. When shes really fed up with something, she really takes on other people? Her anger is absolute and lasts for hours. So I can't tell if I really did something wrong, or shes just unreasonbly mad. Occasionally if shes really angry, she's just slaps me once.
When we were younger, she was even worse with the spanking. She once hit my brother with a pool stick on the leg.
Most of time, its really really loud yelling to the point of insanity. You wonder how my dad and I take it everytime she is mad.
It was effective.. I'm a goody toe shoes now, but it made me fear my mother. I couldn't even go to her when had problems at school or when I felt depressed an suicidal. It pushed me to the verge of almost hating her cause I didn't understand why she had to hit me half the time. Thankfully now.. not scared of her. I still hold anger towards ger, but we get along other wise... Jus hard to deal with when your a kid. People asking you if you love your mom and you can't even say yes.