Mark Teixeira looked down at his feet Saturday night and realized something wasn’t quite right. Instead of his own familiar No. 25 socks, he had a 25 on one foot—and a No. 52 on the other. One of CC Sabathia’s socks had found its way into Teixeira’s locker.

No big deal, he thought. He shrugged and left the sock on.

Two Teixeira home runs, six RBI and a historic Yankee comeback later, a new superstition was born. Teixeira and Sabathia have been swapping socks ever since, each going into battle wearing a 25 on one foot and a 52 on the other for good luck.