[TeMPOraL]

In the future where aliens land on Earth and start a ground assault[0], Elon can take all the Teslas left by fleeing civilians and use them as remotely controlled (soon to be autonomous) weapons to fight the invasion, all from the safety of his volcano lair. ;).

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[0] - Why ground assault instead of orbital bombardment? Well, there aren't many alien vessels left in orbit after a massive onslaught of Falcon 9s and BFRs ;).

[jonkiddy]

If I remember correctly, there is a scene in the book Daemon by Daniel Suarez where autonomous cars are used similarly.