There were tears, there were sneers, there were raised voices... we were nine years old and, in that moment, no other crayon would do.
The tussles of our youth seem petty now we're adults but at the time they were a big deal. Finding out that somebody didn't want to be your friend anymore because you weren't good at hopscotch or because you refused to share your fried egg sweets was heart-breaking - who was going to be your country dancing partner now?
But, in most cases, we made up. We discovered that there was more than one brown crayon in a set, that What's The Time Mr Wolf is a much better game, and that, in the interests of getting along, it's better if everybody just has their own bag of sweets.
And then we grew up. And because adult relationships are based on more than a shared love of colouring in and pretending to be a wolf - although the best ones involve at least a little of both - the potential for them to break down is much higher.
As discussed in my last post, a good friendship is as wonderful and warming as any hot chocolate money can buy. And with every year that passes and as we get more grown-up, busy, and occupied with laundry, the more precious our time together becomes.
By the time we reach our late twenties we've all known our fair share of friendship highs and lows. There's the list of people with whom it's worked out - those chums who could steal every single one of our Percy Pigs if it made them happy (and if they promised to replace them post-haste) - and then there's the others; the ones who got away.
Unfortunately it's just a fact of life that not all friendships survive the test of time; some people just aren't destined to be our buddies forever.
And it's one of the toughest lessons I've learnt so far - aside from the fact that if a jumper says 'Wash at 30 degrees' it really means it - that sometimes you just have to let a friendship go. No matter how excellent it used to be or how compatible you were on paper, sometimes you have no choice but to walk away. It might be because you've outgrown one another, or stopped getting along, or maybe it's because they've questioned the value of watching Coronation Street one too many times - whatever it is, you know when a relationship has run its course.
Of course it's not a decision to be taken lightly, I've only done it a couple of times in my life and it hurt - a lot - but the alternative is worse. Chasing a friendship that has died is even worse than continuing to pursue a man who doesn't want to go out with you, because the odds are that you've known each other longer - and that the break up is more complicated than him just preferring 'women with bigger boobs'. When you know it's over, it's better just to step back, put the whole thing down to experience and move on.
But it doesn't mean the friendship wasn't still worthwhile - it's OK that some people only come into our lives for a set period of time. Perhaps they used to like to join you in a rendition of I Need You by 3T, or they were the person kind enough to tell you that pigtails aren't a good look for an adult, and for that you will always be grateful. Times just change and sadly the odds of taking everybody you've met along the way with you are low.
As to what it takes to make a friendship last forever, I'm not quite sure. Like any relationship, it's all about timing and tolerance and a mutual commitment to making it work. If you've got that, a shared passion for terrible television, sugary sweets and nineties music, I'd say you're onto a winner. Oh, and a stationery set that's big enough to go around. I find it helps prevent arguments.