I've had a loaded gun drawn on me in anger and been threatened with a knife but 2 scariest moments were:
went to dr's with a really persistent headache and he advised i go to hospital for a scan. When I said I'd have to go home to get my wallet the dr called a cab for me and paid for it...
Bizarrely enough I had a very similar experience to this but whilst I was on lsd. The lady whose ex it was happened to be a black belt in some martial art and there was an epic fight while I tripped out of my nut. Must have been about 30 years ago now.