It's a Small World Afterall

I sat down at a random place for dinner last night, at a random time, next to a couple of random people. They sounded Australian, so I started asking them for some input for when I go to Oz. I told them where I was going, who I knew there, blah, blah, blah. I am going to be visiting friends that live in Sydney. The two people siting next to me at dinner are from Sydney. Turns out the girl I am sitting next to is friends with the sister of the guy I am visiting down there.