Not that it was remarkably maturely, but I think that it's funny, so:
I'm maybe, I dunno, 5. The family goes to a theme park that has this ball pit. Little kids can swim around in them. I'm waiting in line and this group shows up sporadically, spread out over the line. Everyone in the group is somewhere in front of me in line except this one little girl, who is right behind me. They hit the maximum number of kids in the ball pool right as I go in, and the attendant says to the little girl "no, sorry, we can't have any more, you have to wait for the next batch" and she starts to cry. I say "let her go ahead, and I'll wait for the next batch". The ball pool attendant, who didn't want to deal with some hysterical little kid, says to me, "Thanks, kid. Here, you want to say something on the loudspeaker?" and without waiting a sec, sticks the microphone right in my face and keys it. I didn't, in fact, want to say anything on the loudspeaker, and say "No", which of course comes out hugely amplified over the ride's sound system. Every kid in the ball pool looks up petrified, trying to figure out what they just did wrong.