Its amazing how unpleasantly people react when the subject of MP3 use comes up.
You are either a liar, holier than thou, or retarded, (which is an exceptionally offensive phrase to use and adds nothing to the debate - shame on you).
The banning of MP3 during races is for a good reason, and its unlikely to have been by a Security Guard fram Asda trying to spoil your "movin and groovin".
It would be interesting to hear a reasoned justification for ignoring the rules of a race you have entered that rises above the hurling of childish insults. Just Caz capable of that so far sadly:
Ambulance urban legend? Hmmm - maybe it comes up so often because it happens so often. Dont know - I've only seen it once.
Was it uncomfortably loud? Dont know - but only the guy with the headphones on failed to realize there was an ambulance behind him until physically accosted by other runners. No-one else was so focussed to become confused by the presence of the ambulance.
The runner I nearly saw killed was the only one wearing headphones: those without became aware of the speeding idiot, and moved to the left. I dont think thats coincidental, and I dont think he was the only runner focussed on his run.
Headphones may have a place in training, and the safety of wearing them is entirely your choice, but if you dont agree with the rules of the race dont enter.