Mine is to go for an operation and not be knocked out completely, therefore being awake during the op but not being able to move or tell anyone about it.
thats sort of happened to me jack only it was after the operation. i could hear everything everyone was saying but they couldnt bring me round. It was one of the weirdest things that as ever happened to me. They were saying my name and telling me to wake up and I know at one bit they put the oxygen mask on me even though i didnt feel it. I couldnt so much as move an eyelash. It would have to be something really serious before I let anyone put me under again.
im frightened of crowds, shops (particularly clothes shops) and loosing control, i have collapsed and although i could hear everything i could do ****** all to help myself and was reliant on them. mind the paramedic was fit!
Worst fear would do be lost and not know where i was or what i had to do to get home again.