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A little boy liked chasing little girls on the playground. They put a stop to that with 1 word.
It might seem small, but teaching kids from a young age the importance of stopping when someone says "stop" means they're more likely to respect each others' boundaries as adults too.
10.30.14
The whole conversation actually sounded like this, but I couldn't get it into 140 characters:
ME: "What did you do at school today?"
HIM: "Play."
ME: "With who?"
HIM: "There are some girls I like. I used to to chase them, but they told me they did not like being chased. So I stopped. Now we all play what we all want to play."
ME: "That's cool little man. It's totally cool."