I'm a sucker for quizzes; the Guardian has a particularly good one on Saturdays, and despite knowing not very much about not very much, it's fun. There's a real art to good quiz questions; questions you know the answer to immediately aren't great, and questions where you have no idea (even after hearing the answer!) are no fun either. But questions where you suspect that the answer is in your head somewhere, or where hearing the answer makes you say "Doh!" are ideal.
Every so often I hear or read questions like that, and I always intend to remember them, but never do. So maybe a blog is a good place to jot them down; I've given them a category of their own so I can easily list them all on one page when I want to remind myself. We'll see how many accrue.
Here's the first one: What's next in this sequence of colours?
Brown, blue, pink, orange, red, yellow, green, ...