Adrian Kingsley-Hughes points to piece that all too well demonstrates the tendency to take unfortunate events and draw irrational conclusions. In this case, the implication is that the death of a British Columbia man who was hit by a falling helicopter could have been averted if he hadn't been wearing his iPod.
Now, I don't know about you, but iPod or no iPod, I really don't expect to be crushed horribly from above by a wildly flailing helicopter when picking up my mail. On top of that, I really don't fancy my chances of dodging an inbound chopper whether I was wearing earphones or not.
It's not exactly as if earphones were invented with the iPod. Old people have been railing against the evils of "that damned racket" since before the Sony Walkman was introduced.
There are certainly good personal health reasons to keep the audio piped into your ears to a reasonable volume, but retaining your ability to dive, John McClane-style, out of the path of an incoming helicopter is not one of them.