I have another anecdote about pain. A few years ago, cycling at night on the then-under-construction path by the Cambridge Guided Busway, I bounced off an invisible kerb and noticed the “pain” from the fall before I hit the ground, when I was still at a ~45 degree angle; yet when I then picked myself up and cycled on to the cinema I felt no pain — even though, when I checked myself at the end of the film (one of the Hobbit films), I found I’d been bleeding enough to make quite a mess.