When I was still working all those years ago, once in awhile my Dad would stop by to visit me in my office. It was only a few times, but I was so glad to see him. The last time he stopped by my office was probably more than 15 years ago. I can see him walking in the door now. He had a big smile on his face. He was still driving then. I said: "Dad, I'm really busy now, this isn't a good time.", or something else equally stupid. He said ok and he left. I think that was the last time he came to see me when I was still working. A few years later he passed away.
I would give my life to have those minutes back. I would say: "Hi Dad! Come on in, you want to get some lunch?"
I'm sorry Dad. I love you. I miss you.