Question

Josie and Billy have dated so long they often are able to finish each other's sentences. Although they think it is cute, it can be the beginning of which communication roadblock?

Answer 1

In a way, it could be because Josie could already tell what billy wants or what he (thinking of words) you know, she already knows what he is going to say. So both know each other to know what might happen in the future....
It sounds weird but sound it out in your way :p