Remember that funny feeling you get just before you have a nose bleed?
It gives you just enough time to realise that you're about to bleed on yourself, but barely enough time to do anything about it.
The best people manage to do is move their head forward, and get their hand under it.
I can't remember the last time that my nose just spontaneously started to bleed. Some time in primary school I guess. I never was much of a nose bleeder. There was always that one kid who seemed to have them all the time.
I had a good mate in primary school (his name was Nick, but his last name escapes me) who got really sick. He used to just faint. I remember I was sharpening my pencils over the bin with him in year two and I looked at him, and his eyes rolled back in his head, and he just fell (like someone had kicked his knees out from under him). I sort of caught him, and guided him past the bin as he fell to the floor.