What is it with the whistle?

Okay what is it with this whistle thing? It must be a gift from God for a select few people that by putting their fingers in their mouth and blowing can make a sound that will stop people dead in their tracks. My pastors wife has this gift and she uses it, my youngest sister has this gift and she can stop me and my kids in a New York minute when she uses her "gift" I unfortunately dont have that ability and hell that sucks when I need the kids to behave etc...there are also times that it gets annoying, like when my sister overuses it. But what is it with the power that a "whistle" like that causes? Can you tell I am bored here. The kids are both asleep and Rey is at the gym or wherever so I am just blogging to blog....Just a random thought....