Vince Vaughn has the end of his thumb missing
At the time of the accident, Vaughn was a passionate polo player. However, after the accident, doctors advised him to give it up.
Vaughn has embraced the accident with predictable humour, though: he calls his mangled thumb a “penis with a fingernail”.
You can see it in this picture
The accident was also a blessing in disguise. No longer being able to play polo, Vaughn invested more time into another of his passions: theatre. And that, as they say, was that.