At risk of being a downer in response to a light hearted video and comment, I've read that smartphones can become dangerous projectiles during car accidents.

Imagine the speed they could travel at a very sudden stop. Posing a pretty big risk to people in front of them, not to mention themselves. In this video the phone nearly smacked the girl in the face.

After reading that I always make sure to check my phone on my lap while in a vehicle and not up towards my face where it could go flying at a sudden stop.