Fourth Life of 50D
I purchased my 50D refurbished from Canon, so I can't tell you about the first life.
When I bought that camera, I was taking advice from dpreview member suggestions that it was the glass that mattered, so I matched my refurbished 50D with a new f2.8 70-200L. This combo was great for sports photography, even at night. I have a treasure trove of shots of my son playing high school and college soccer.
Then I wore out the shutter and moved up to a 7D, a truly great camera. I had the 50D shutter rebuilt and matched the camera to a 500 mirror lens, which I kept attached almost 100% of the time. This started my birding & wildlife phase. Also, it was a fun challenge to work with a manual lens. The mirror shots are not sharp, and the keeper rate is low, but I have come to appreciate the look. No pixel peeping!
After some time I decided it was time to break out in a new direction, so I had the 50D converted to Infrared. The shot below is from last weekend, my first full day with my infrared 50D. Conversion by Lifepixel - they do a fantastic job. Now it is up to me to get good captures and keep this 50D going.
I much prefer the 7D, but it will be a while until it catches up with as the image count of the 50. Both cameras are right up there with my film era A-1. I can't part with any of them.
Photography and nostalgia are closely related!