That is horrible.
Mac is right though, this type of thing does happen a lot, but it's usually something flying off a big rig or someone's trailer on the freeway and going through someone's windshield. Some woman was killed last year while she was sitting at a red light at an intersection when a metal piece came from the highway above her and went through the driver's window. They mentioned in the story how many deaths had occurred the previous year in Houston from flying objects.
Every time I see a person on the highway on a motorcycle or someone in a convertible I think how exposed they are if something were to go flying their way. I've had my windshield cracked numerous times now when driving on the freeway; if it's able to do that you can only imagine what it would do to human flesh.