There's a kid you used to be unkind to. Maybe you've grown up a bit, or moved groups, or just changed — but looking back, you don't like how you treated them. You weren't a monster; you were a kid doing what the group did. But you remember specific things you said, and you suspect they remember them too. Now you see them around, and there's an awkwardness. You could keep ignoring it, let the past stay buried, and hope they've forgotten. Or you could do something much harder: acknowledge it, maybe even apologise, and risk dragging up something you'd both rather forget.