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Oh, you meant Other People's Kids.   They're the worst!   Those you can whack upside the head anytime, except when someone's looking.
Exactly.  
However, currently, it's hilarious to get the 3 y/o to STARE at the tantrum throwing 10 y/o (like full on the floor, kicking and screaming until he got the toy he wanted) and loudly claim "MOMMY!!!  He's being a BIG baby!" and she doesn't quite yet get the concept of inside voice or to not loudly voice what every adult in the area is thinking.  I don't know why the parents of the tantrum child thought mine was a problem.  Ok, I did tell her to keep her voice down, but nothing else.
It's also how she gave up her paci.  Walked over to an 6-7 y/o who was screaming bloody murder about not getting a cookie.  Handed her the paci saying "Babies need.  I big."  and walked away.  
Can you tell hissy fits and whining are so not accepted behavior here, so the kids learn EARLY to not bother?