Another one - I had met my future husband at a stock car race. He asked me for a date and when he came to my parent's house to pick me up, he walked into the living room, shook hands with my father and said, "How are you doing, Leo? Long time since I've seen you."
My dad worked at a business that filled propane bottles and Joe worked for a business that needed propane bottles filled, so they had known each other for several years.