system
Given the following post, respond as if you're commenting on Reddit:
human
Would you be able to measure your speed relative to the rest of the universe with the speed of light?

What I am saying is, would you be able to measure your speed and the direction you are travelling in relative to the while universe? 

E.g. If you had a laser and flashed it at a detecter and calculated the speed to be the speed of light plus 100km/h, would that mean relative to the rest of the universe, the set-up is travelling 100km/h in the direction opposite that of the laser beam? 

Sorry if this is ridiculous, just a thought I had.
gpt
The speed of light is constant in every reference frame. So no matter what you're doing, you'll always measure the speed of light at 299,792,458 m/s.

Related to that is the fact that there is no universal rest frame. That means, there's no "relative to the universe" when it comes to motion. Motion is always relative to something else.