Just an observation:
Maybe the reason why people don't use strong passwords for websites like phpBB and Myspace is because they frankly do not care. When every site requires a password, people usually choose a simple easy to remember password for websites like these, and choose to keep their strong passwords for banking websites and the sort. The sites obviously have security holes, so I wouldn't use a serious password.

Actually, the sagging pants trend was started in prison. Inmates are not allowed to have belts to prevent them from hanging themselves. And when the guards issue the inmates their new wardrobe, it hardly ever fits perfectly, so the pants sag. Then, the trend worked its way into hip-hop. Later, mainstream culture kicked in, and the rest is history.