I've smacked DD 3 times.

Once for spitting in my face (tap on the leg)

Once for unbuckling her seat in the car when we were on the highway (another tap on the leg)

Once for 'launching' herself/belly flopping herself over the couch and landing on my stomach (I was lying on the floor, tbh I can't remember if she did get a smack for this I remember being really mad & hurt but I think I may have just pushed her off me)

So twice.