Jingo

'Neighbours... hah. People'd live for ages side by side, nodding at one another amicably on their way to work, and then some trivial thing would happen and someone would be having a garden fork removed from their ear.' And when the neighbours in question are the proud empires of Klatch and Ankh-Morpork, those are going to be some pretty large garden tools indeed. Of course, no-one would dream of starting a war without a perfectly good reason such as a 'strategic' piece of old rock in the middle ...