When he was still in the minors, he bought a new pair of spikes and hurt his feet. In the sixth inning, he took them off and played the rest of the game in just his socks. The other players kidded him, called him Shoeless Joe, and the name stuck.
12 seconds sound clip from the Field of Dreams (1989) movie soundboard.
You can hear this line at 00:14:19.759 in the Blu-ray version of the movie.
Quote context
[...]
- But I also think if you really feel you should do this, then you should do it.
- What the hell is he doing? He's plowing under his corn.
- Why?
- Could he hit? Lifetime average, 356, third highest in history.
- Why'd they call him Shoeless Joe?
- He's going to lose his farm.
- Then in 1919, his team, the Chicago White Sox, they threw the World Series.
- It means they lost it on purpose. Gamblers paid them to. Except Shoeless Joe.
- Now he did take their money, but nobody could ever proved he did a single thing to lose those games.
- I can't.
- Twelve hits including the Series' only home run, and they said he's trying to lose?
[...]