I remember when that trend first started at my school in '92...didn't see it but the assistant principal (former Celtics player) came on the PA one morning and (in direct quote) announced "There's a new trend that will stop right here at 7:30 AM this morning...If I catch anyone with their pants hanging down, I will come down on you like a ton of bricks".
Of course we all laughed thinking "who would do such a stupid thing?" Then later we saw it first hand for ourselves. Shocking.
Funny thing is when asked, there's no justifiable reason for them wearing their pants improperly, but some of them try to insist it's better than when you see some guys wearing their skin tight wranglers.
Not that skin tight wranglers are really any better to look at but at least the pants are being worn properly, and not like some prison bitch.