How did you find your cat?

I always had cats growing up, and they were always free. I remember driving by a "Free Kittens" sign in elementary school and asking my parents if we could get one. When I got home the next day we had two new kittens. One of them is still alive and kickin', the other ran away a couple years after we got him.
Another one of our cats just wandered into our yard one day and never left. My brother was friends with the cat's owners down the street and they told us to keep him. He passed away last year.