If you want to know the truth about a baseball player, ask his teammates. Spending nine months a year in near captivity with a group of men yields a treasure trove of information about quirks, habits and passions—stories that are rarely heard outside the clubhouse walls. Enter The Wall Street Journal's unscientific personality survey of the Yankees. Over several days this season, we polled 17 players on a variety of questions to find out the unvarnished truths about their teammates.

1. Who has the hardest time tying his tie...