I was just driving home down the 405 in torrential rain and I came up behind an SUV with no lights, swerving across lanes. Figuring this to be a pretty dangerous situation, I decided to call 911... and I got a busy signal. So I tried again. Busy. Tried again. "You have reached 911. All our operators are busy. Please be prepared to explain the nature of your emergency..." and I hung up.
This is why I own a gun.