While eating a meal at some friends the other night I managed to accidentally bite the inside of my mouth, which was rather painful. It always surprises me (although it shouldn't) how good human teeth are at chewing through the inside of your mouth – I guess the inside of my mouth is no different than a steak cooked rare so there's nothing stopping my teeth slicing their way through, that's what they're for.
As with all cuts to the mouth, it takes a while to heal and every time you eat an apple or biscuit, you get stabbed in the wound and feel a sharp pain. But that's nothing compared to chocolate.
I was eating a snickers bar and a piece found its way onto the wound and it was searingly painful – like acid burning! That set me thinking so I tried various different things to see what hurt the most. Irn Bru (which you'd think would do loads of damage) was fine, just a little stinging. Salt obviously hurt quite a bit, but that was a good pain since it dulled the pain afterwards. A satsuma (or was it a clementine?) stung a little but it was only short-lived. The apple, as I mentioned, hurt but that was more from being stabbed by the skin of the thing. Terrible decaf coffee from my work vending machine has no effect aside from the heat and dreadful taste. Bonjela, which has long been my treatment of choice for mouth ulcers and the like, is rather painful for a short time too, but as with salt it does it some good so it's not a bad pain.
So chocolate is still the winner on account of the pain and lack of positive benefit from the pain. Any other suggestions before it heals up?