I've enjoyed Stephen Fry's work for a long time, and his special on Netflix, More Fool Me, gives you points to ponder and many giggles. One of the great points he made was that all of us should be able to name our eight great grandparents, as they lived only two generations ago. I could do almost everyone, but I don't think I'll forget again soon.
So tell me the names of your eight great grandparents. And make sure you watch his explanation of the invention of chess.