We got new phones at work a few months ago. At first, every time someone called me I would hit the ceiling. I soon found the volume control button and that helped a bit. But there was still something jolting and abrupt about that ringer.
I thought I would get used to it, and I did. About two months later my reaction had toned down a bit and I only leapt from my chair about once a week.
And then I went on a work trip and was away from my special phone for about two weeks. Added to the fact that the novelty of the ringer is back, but also - since I was out of the office for a couple of weeks, everybody and their brother is trying to get a hold of me now that I've returned.
So the moral of the story: if you need me, I'll be clinging to the ceiling right above my desk chair.