That's when you make a remark like: "Yes, I know, it's WWI -- you know, the one that got started when Archie Duke shot an ostrich because he was hungry?" And watch their brains explode. ^______^

(BTW, if you've never seen Blackadder, that was Baldrick's intepretation of "when the arch-duke of Austrio-Hungary got shot." It makes about as much sense as fandom, really. ;))