It starts thus:
The English are feeling the pinch in relation to recent events in Syria and have therefore raised their security level from “Miffed” to “Peeved.” Soon, though, security levels may be raised yet again to “Irritated” or even “A Bit Cross.” The English have not been “A Bit Cross” since the blitz in 1940 when tea supplies nearly ran out. Terrorists have been re-categorized from “Tiresome” to “A Bloody Nuisance.” The last time the British issued a “Bloody Nuisance” warning level was in 1588, when threatened by the Spanish Armada.
Why is this paragraph funny? Well, because, (a) it reinforces common prejudice about the English as understated and stiff-upperlipped people (most jokes derive their fun from prejudice), (b) it reaches its aim by displacing the hierarchy of defcoms alert levels with a more fundamental ordering on the (purported) English character.
We've created a schema for fun. Whom else is around to apply it to? Let's start nearby, one step at a time. The Scots, right: