The Deaf Generation
Though I probably won't be around to see the worst of it, I've been predicting for years that the iPod generation are going to have more than their fair share of deaf people. Almost daily, I'll be sitting on the train on the way to work and there'll be at least one younger person with earbuds loud enough that I have identify the beat of what they're listening to, if not the actual track to which they're listening. If I can hear your earbuds from 10+ feet on a moving train while they're in your ears, you're listening to your music too loudly.
What's worse tho' is the nanny-staters wanting to step in to help those who're too stupid to figure out for themselves that protracted exposure to loud sounds = hearing impairment.