>>12509176take the "twins paradox" situation
if someone goes on a round trip in a fast rocket, when they come back they'll be younger than the people who stayed
if they go at the speed of light, they won't have aged at all
if they go faster than light, they'll have aged by a negative amount
in that case it would become a true paradox, because relativity (special or general) simply doesn't FTL travel
just because you can try to use your imagination to ask yourself "but what if faster than light" doesn't mean it makes any sense
it's like asking "but what if 1=2"?