What pointless pieces of information do you have stored away in your brain?

So, when I was about five or six - forty-odd years ago - my granddad leans over to me one lunchtime and says, in a very serious voice, "If anybody ever asks me what the longest river in China is, to say that it's the 'Yangtze Kiang'". "The What?" "It's the 'Yangtze Kiang', Robin. And don't you ever forget that!"

Cue about seven or eight years later and I'm in second or third year in secondary school and I'm away with the rest of my class on a social with a boarding school (let's call it R) some distance away from my own (let's call it G). We'd been warned by the class ahead of us that the quizmaster from the other school would hand his own kids easy q's and us the tough ones. So the quiz goes ahead, we're doing well being two points ahead after some hopelessly one-sided questions from the R quizmaster. Then this:

Quizmaster to his own pupils: What do the letters VAT stand for?
Guy on other team: "Value Added Tax", Sir!
Quizmaster: Correct! One point!
Quizmaster to guy on our team with strong Dub accent: What color is a Friesan Cow?
Guy on G's team with strong Dub accent: Uh, green?
<cue loud laughter from everybody, including our side; poor guy goes the color of a tomato>
Quizmaster: Wrong - no points!
Quizmaster to his own: What is the currency of England?
Guy on other team: "Pound Sterling", Sir!
Quizmaster: Correct! One point!
Quizmaster: Ok, last question, equal scores to both teams. If G get this question wrong, it's sudden death. G, are you ready?
Me (squeaky voice): Yes.
Quizmaster: What is the name of the longest river in China?
Me (not squeaky voice): It's the Yangtze Kiang. Sir.
Quizmaster (after a pause): Uh, yes, G. The "Yangtze" will do fine. G win.

BTW, wiki tells me that Yangtze Kiang went out of fashion in 1979 *sigh* granddad might be disappointed if he were still around. Or maybe he wouldn't be