Relative Motion (Not Relativity)

Zak and Derek discuss a drone flying in an accelerating car. Does it stay in place? Fly to the back, front, ceiling, or floor? (And does the plane take off?)

The original Reddit post. (The actual question has been removed, but the replies feed the discussion.)

Drone in a car YouTube video:

Smarter Every Day balloon (and bubble) in a car:

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