Derek is a real hoot.
Anyone want to play his Superposition Game with me:
I thought up what I call the superposition game back in 2004 as a gedanken device for exploring the foundations of quantum mechanics. The game is to sit down any physicist in the world and get him/her to list all the physical quantities he/she can think of. Then put the quantities into two groups: (i) those that can exist in a quantum superposition, and (ii) those that cannot