your stuff gets 'rearranged' when the aircraft (or car) flips.
Great point.  
I know people who prefer to carry their cellphone in their hand and just lay it down wherever they're at, instead of keeping the phone secured in a belt pouch.  In the car, they lay it on the seat or in a cupholder.  
In my EMS work I have seen interiors of wrecked vehicles that look like the Joplin tornado went through there.  I ask them "how will you call 911 if you're in a wreck?  Don't you know that phone will go flying and likely get destroyed in the impact?".  
They shrug.