What’s That Book?

Recently, my brain has been slightly locked with a question – one even the mighty AQA couldn’t come up with an answer to.

So I’m hoping that posting it on D4D™ might just find someone who knows what the hell it is I’m whittling on about.

Anyway – I read a book a while back, and I’m now trying to remember what the hell the book was. The scene I clearly recall involved one protagonist meeting the other for the first time in a school playground, where they were playing marbles. (At least, I think it was marbles – could’ve been tiddlywinks, or something)

Anyway, Person One knocks one of Person Two’s marbles out of play, and out of school grounds. As a result, Person Two throws one of Person One’s marbles out of the school grounds, and it degenerates into each one throwing the marbles out of the playground.

It’s a stupid scene, but I can’t remember where the hell it came from.

So help me, Interwebs, please…