i'm reading over the GRE prep book and i just got to the question: "System S' travels with constant velocity v≠0 w.r.t. system S. If two events, separated by a distance x≠0, occur simultaneously at time t in S, do they occur simultaneously in S'?" the answer is "No, never". But the "never" part kind of bothers me. If you held two flashlights in your hands and they both lit up at the same time while your friend was driving away from you maintaining the same distance to both lights, wouldn't the events also occur at the same time in their frame of reference?