Depending on context, yes, I think you couldcould.
If it's a box to tick on a form, I'd leave it as 'no'. They're not interested in what you did as a child, it's not relevant, and there's no opportunity to explain yourself. However, if asked in person, I'd be inclined to tell them. No-one is going to hold something you did when you were eight against you and telling them about it gives the impression of scrupulous honesty on your part and builds trust between you and the interviewer.