[AgentZero]

Well, I can give you a number for him, and you can ask him about it but he usually only answers around 12 noon when an attendant is helping him with lunch, since when he's alone the telephone frightens him since he doesn't know what the 'alarm' is for.
As for whether it was on purpose, it was ruled an accident, but the possibilty is there. And it's really not that difficult, given the nature of dust (and I'm not talking a thin film of dust either, I'm talking under-your-bed kind of dust, proper dust bunnies & all that, since the school board had all kinds of red-tape surrounding even opening the cases [since it 'voids the warranty'] so they didn't allow very frequent cleaning), that once it achieves high enough temperature, it creates a nice little air circulation effect, sending dust floating all over the place, and if any of that dust happens to ignite, it doesn't take long for it to spread.
And while burning dust usually doesn't last long enough or produce the heat required to melt and ignite computer components, it can ignite paper, and burning paper does create the temperatures needed to get plastic burning.
So even if I stored my PC in a freezer, I still wouldn't be comfortable overclocking anything.