If you are in a spaceship that is traveling at the speed of light, and you turn on the headlights, does anything happen?

If you are in a spaceship that is traveling at the speed of light, and you turn on the headlights, does anything happen?

如果你在一艘以光速飞行的宇宙飞船里，你打开车头灯，会发生什么事吗?

-- Steven Wright 史蒂文赖特