Yes, but those are silly examples...
If one were to say the starship galactica, driven by darth invader, had a light shining on it, whilst going into megadrive, and po spaceferries were cruising along at walking pace nearby, who would sea what light at what time and date and at what location...
Its this abandonment of absolute time.... Problem is, most people (I am included) know it only by parrotting what our physics teacher say, without REALLY understanding it..