system
Given the following post, respond as if you're commenting on Reddit:
human
What happens if you're driving in your car at the speed of light and you turn your headlights on?
gpt
To move at the speed of light means that you and your car are shortened into an almost infinitely thin segment in the direction of your motion.  Therefore, you are inside your headlights- and inside the headlight switch and they are both inside of you.  You also have infinite mass, as do your headlights, and to activate the headlights you need infinite energy- which you have because you're travelling at the speed of light!  Unfortunately, having infinite mass and infinite energy means that a barrier called an "event horizon" forms between you and the rest of the universe.  Nothing from inside the event horizon can enter back into the universe, so the light from your headlights goes nowhere.

In other words, nothing makes sense when you try to answer this question knowing what we know of physics.