Last night I dreamt I could play the drums. I tried to play them when I was young, but was never any good. In my dream, though, I was excellent: I suddenly got the ability to produce the perfect drum roll. I had no idea where it came from; all of a sudden I found I could use the drum-sticks with ease, hitting exactly the same spot on the drum in a blur. In my dream I wondered where the ability came from – why was I suddenly so dexterous, and why did this dexterity only apply to drumming? Then I woke up, and my questions were instantly answered – it had just been a dream. Oh well, I thought, perhaps I should take up the drums again – perhaps I could actually get that good.