Normally one of the following:
1. Something cowards call when they can't handle someone themselves and are easily offended.
2.A life saver
1. A 350 pound guy, his friend and girlfriend couldn't beat up James when he told them what they needed to hear so they dialed 911 and cops arrested him.
2. My brother dialed 911 when I was choking on food and I was rushed to the Hospital and released the next day.