I remember reading a story re two Sunderland fullbacks in the 1930's.
They couldn't,stand the site of each other and never spoke either during a game, or in training.
The situation wasn't helped by the fact that they both lived in Club Houses next door to each other.
When they had to report to Roker either for training or a game,they both left their houses, one turned right, the other left,and walked to different ends of the street so they could both catch separate buses,and not be forced to travel together.