I have a WONDERFUL tale about this.
Once, for a game day at our FLGS, I prepared an adventure to run, and waited for the players. They turned out to be a group of 12-year-olds. One of the boys' mother dropped them off, slightly wondering what this experience was going to be like. In my most professional demeanor, I assured her that everything was okay.
Then I quickly censored the adventure to PG.
The kids were quite new to the game, but very excited, and had characters already prepared. I looked them over, and we were off!
First, the plot hook--they found a poor, bedraggled girl having just escaped from some goblin mine, and the local constable let them know that yes, this goblin hole was becoming a greater threat to town. If only someone would help...
"WE'LL SAVE YOU!" the players proclaimed simultaneously. No, "What'll you pay us?", just a pure, just, heroic call to action.
It brought a tear to my eye.
The group was amazing. Every step of the way, they acted with the purest of intentions, and were an incredible team. The only problem was that they would tend to get excited and call out what they wanted to do all at once--but some quick-paced discussion of initiative, and everyone knew that they would get their turn to shine, so no problem. They always made sure the other members of the party were safe. At one point, one PC has become disabled, and told the rest of the party to go on without him, he'd only slow them down. "We won't leave you here!" the others called back, and protected him as they moved forward to find a healing potion.
It was a true and utter joy to be able to run a game for such a naturally noble, good, stout-hearted group of friends like that. When the mother came to collect them at the end of the game, I let her know just how wonderful they were, and how proud of them she should be.
If only we all could keep that kind of magic in our hearts.