This has happened to me twice now. The first time I assumed it was someone set a mine in a car. But it seems to be that when a car is sunken into the ground at a default spawn point, when you get into the vehicle it goes crazy and kills you.

It looks like it attempts to stabilize the car above ground, but for whatever reason it causes you to die. Here is a video of the 2nd time it happened to me: https://1drv.ms/v/s!AoZFxkhBS88UjxiUITPA9v8a-1Wt