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

This quote by Steven Wright is a funny method of questioning the laws of physics. It implies that if a spaceship is travelling at the speed of light, then the headlights would not be able to light up anything given that the light from the headlights would be travelling at the exact same speed as the spaceship. This would imply that the light from the headlights would not be able to reach anything in front of the spaceship, and thus absolutely nothing would happen. This quote is an amusing way of questioning the laws of physics and the concept of travelling at the speed of light.