I was standing with my back against the window, holding on to the hand-rail above me. Psycho Bus Driver hammers round a mini-roundabout, causing some squeaks of astonishment as everybody is thrown to the left. He realises he's about to crash into someone's garden and suddenly straightens up, throwing us all back to the right. At this point, because of where I was, my lumbar region connected with the hand-rail behind me quite forcibly.
It was a bit jarring, but I only had two more stops before home, so I was just glad to be off. My back was a bit sore that evening but I didn't really dwell on it. But Thursday morning, when I tried to get out of bed, I found I couldn't. The pain was astonishing. I had to flop onto the floor and walk my hands up the wall just to get onto my feet.
I've had back pain before - I used to get it all the time after I'd spent a while working at a bad desk. But this was the worst back pain I've ever had. I managed to make a coffee, then went to the bathroom only to find that I was almost incapable of lowering myself onto the pot. This, I thought to myself, is what it must be like to be very old.
I called in sick, dropped a cocktail of painkillers, and spent the rest of the day trying to find a posture that would alleviate the pain for more than a few minutes at a time.
I suppose I should have gone to see a doctor and then sued the crap out of Arriva (the bus company), but unfortunately I don't think like that.