The power button on the top of my iPhone is jammed. I have to make sure my battery is always charged, because if my phone ever dies, I will be unable to turn it back on.
If it dies due to lack of charge, it comes back on automatically once you plug it in, no problem... takes a while though. I suppose you will only ever need to switch it back on if you actually manage to switch it off.
My first world problem... ate too much pizza the day before and still suffering heartburn.