Vincent, for an object with mass travelling at speed of light, would make Einstein gnash his teeth or dentures in his grave position that he is currently in now. It would imply mass increasing to infinity. And I ain`t talking here Nissan ersatz luxury division. But I have my mumblings as what could be a suspect of going beyond speed of light.
Namely, black holes. As we know black holes have ravenous appetite curbed by unfathomable gravity. Evn light doesn`t have power to leave its gravitational hug. So we conclude that gravity does affect light. So if a poor light beam can`t get out, what happens to the same poor beam that is approaching the black hole and with full throttle open going beyond event horizon and strutting past accretion disc? Remember the light is already flooring the gas pedal at its legit limit of 300 000km/sec. In order to adhere to the Einstein`s devised speed limit, we have to conclude that the immense gravity of a black hole would have no effect on incoming light. If it did, it would brake the Pandora box open, while somewhat nailing a coffin of one patent bureau employee, who managed to have too much time on his hands to tinker in God`s pantry and answer questions noone dared to ask.