Einstein imagined what would it be like if one would race with light. For the racer, it seems that the light sped away from him at c. But at an intertial frame of reference, the guy seemed to be catching up with the light beam. But, is it possible for the stationary observer to see the racer surpassing the light beam? Also, would there be any pronouced relativistic effects if one could travel say, a 100 m/s in a BEC, where light travels at around 10 m/s. Or are relativistic effects only felt at velocities close to c, regardless of the medium?