Well, I've been smashed in the nose a few times with hockey sticks, that wasn't fun (it was gushing like taps turned on full, out of my nostrils and all over the school's historic carpet).
I also get spontaneous nosebleeds - one doctor actually told me to drink it, because they were concerned I would get anaemia...I filled a pint glass from one nosebleed.
Then the other day I was swimming and it looked like I had been properly punched in the face, got it everywhere, but not so much in the pool, thankfully - I've only just started going to that one >_<
It's really strange as my blood clots extremely quickly if I cut myself, and the wounds heal quickly too - it's just nosebleeds that don't stop for around 20 minutes and pour away.