I would never ever spank. However I do think there is a place for a smack in appropriate circumstances. An emergency and dangerous situation with a laughing persistent child I think sometimes warrants a light smack. Not hard, not in a sensitive place (not the face!), not to bruise, possibly not even really to smart, but to surprise into inaction. Mostly for younger children where words and reasoning don't really work or at least not quickly enough. I am a biologist and we are mammals and all mammal parents use what resources they have to teach their babies.