My MIL came round today and was spending some time with DS1 (3) in the living room whilst I was busy in the kitchen. When I went back she announced proudly that they'd been playing a new game. "Smacking," piped up DS1 excitedly. "Pretend smacking," explained MIL who then proceeded to demonstrate by smacking his bottom. Not hard, and all in a playful manner, but it was smacking nonetheless.
Now forgive me for being pedantic, but pretending in my book means not actually doing the thing. If you pretend to touch something, you don't actually touch it. If you pretend to eat something, it doesn't actually get eaten. This is what DS1 had learned too. So when did pretend smacking turn into real smacking? Later that day DS1 started "pretending" to smack me - after all the efforts I've made to teach him that smacking isn't acceptable.
She means well, but sometimes she really doesn't have a clue.