I think many or all of us have done something that's relatively unique that can make for a neat story. You don't have to indulge in the full story, but maybe if someone asks, you can elaborate.
I'm thinking something that's safe to say that very few people on the earth have done, but not zero. Like, there's a good chance that you'll never meet someone else who can say the same thing.
So, what's your claim to fame?
I'll start with a reasonable one:
I was at the game to see Wayne Gretzky score his last hat trick. He only managed to get 50 of those.