Winter flying and turbulence, not such a big surprise. Why is it that so many people think they need to be up when the seatbelt sign is on or sit in their seats with the seatbelt unfastened? Idiots. Same thing with parents too cheap to buy a seat for their lap kids. Lap kids are nothing but projectiles in turbulence. Get a brain parents, buy a seat and put your kid in a car seat.
I was recently a passenger on a somewhat turbulent flight where the passengers insisted on not only using the bathrooms but opening overhead bins and standing around the cabin. I promise that if you fall on me in turbulence I will sue you for damages.
People who get injured while out of their seats or in their seats with seatbelts off deserve it. Oh, the pilots do not have "turbulence radars" either. Just saying.