Have you spanked your child/children to discipline him/them? What was the reason?

Honestly, it's unavoidable. I have done it before since my almost pre school kid doesn't always follow the rule. Spanking children is a big no no but sometimes, when they don't listen when you tell them "No" or "Enough"; spanking seems to be the last resort. Fyi, I do feel guilty though after I spank my eldest. It feels wrong.