My first one.
1961 at the old Met saw the Twins and the Yanks.
Mantle hit #48 that day along with a double and a single, also stole a base. I was a young boy and a big Yankee fan. But, when Roger Maris stuck out to end the game he was still arguing a called third strike 30 minutes after the game.
The Twins won the game 5-4. I became a Twins fan that day, and have been ever since.
A few years ago, at a book signing, I told Mickey this story, and he laughed.