在sss中听到一个东西,不理解.求翻译

在sss中听到一个东西,不理解.求翻译
On that eventful day in 1974 I was out, with a graduate student, Tom Gray, and we were walking back to our Land Rover to go back to camp to enjoy a swim in the river with the crocodiles and enjoy a nice little lunch. And I am always looking at the ground. I find more quarters by parking meters than anybody I know, I think. And you know how it is you find what you’re looking for, right?
其中I find more quarters by parking meters than anybody I know, 这个是什么意思呢?为什么作者说道这个东西的时候,观众要笑呢?ps这个作者是一个古生物学家,是第一个原始人Lucy的发现者,他在讲他发现Lucy时的经过.