Some day I was driving my spaceship that can go as faster as light velocity. (in year 2175 all of us believe Einstein was wrong). Suddenly, a dumb driver appeared in the galactic highway with a old fashioned spacecraft, and when I reach him I stood behind him wanting to express my angry. To my surprise, I sounded a lot of times the horn, but nobody of the cars in front of me heard no sound. Then, I thought in the Mach cone and this sorts of things and using those unpractical tools of the physics, I invoked the special relativity postulated and switched on the frontal lights like flickering. Hey, I discovered that going at light speed my lights worked! (After all Einstein was not so wrong). To point this in another way more serious, sound interaction seems to be a perturbation over some type of steady mesh (not participating of the spacecraft movement). But light rays seems to be a little bit different, isn't it?. Although I think they might be similar. The question that anyone of such stupid drivers can hear me if I sound my horn if I'm going supersonically, but can see me if I switch on the lights, seems to be a little bit puzzling!. Anything to say about?