'If my Oyster pre-pay is working today on all these trains, why can't it always work on all these trains? Why do I have to buy a travelcard twice a week, and remember to take my Oyster card out of my wallet so I don't instinctively touch in or out? Whose heads do I get to bang together?'
I know that this is not an original or scintillating observation. If you want something scintillating about Oyster cards, go here.