it was probably down to a 2 hour operation, under local anaesthetic, which kept wearing off, in an out patients cubicle sewing back together some severed tendons, thats after first probing the deep open wound with a sharp instrument looking for nerve damage, no anaesthetic!!!!
Afterwards even a nurse took me to one side and apologised saying that should never have happened. I should have sued but it never crossed my mind LOL, bit late now happened nearly 30 years ago