In 1918 the Boston Red Sox had won another World Series making it their 5th. The Red Sox were at the time considered the best team in baseball ever. One of the stars of the Red Sox was a young pitcher by the name of George Herman Ruth. During the 1920 season the owner of the Sox needed a little extra cash to finance his girlfriends play called "No, No Nanette". To raise the money Frazee sold Ruth to the New York Yankees for $100,000 dollars and a loan collateralized by Fenway Park. Since Ruth was traded to the Yankees, they have gone on to win 26 World Series Titles. The Red Sox on the other hand, have been to four World Series, losing each in game seven.
Not only did they lose The Babe, the Yankees also "owned" fenway as it was collateral on a loan.
I'm a Yankee fan from when I could speak. I went to my first game when I was about six.