I've seen lots - an uncle suffers from severe epilepsy. I learned from a very early age that there really isn't a lot you can do apart from giving the sufferer space and making sure they don't hit themselves on objects nearby. It looks very scary. I suffered several fits in my late teens and I remember coming round the first time - I had a seizure at my desk at work, and my boss was shaking my shoulder to wake me up. I thought I'd fallen asleep at work. I still find it amazing that something so dramatic can occur to your body, and you don't even know.