Well, it actually started when he was just an egg, laid in a flowerpot that his parents took over on my balcony.
After hatching, I paid close attention. Since I was working from home at the time, I would go outside and hang out with him when his parents weren't around.
One day, when his parents showed up to feed him, he got so excited he fell out of the nest and the parents just sat there not knowing what to do with their excited little son running around beeping for food at them.
Having heard a million wives tales about birds killing their children if they get 'human smell' on them, I was nervous to try this, but I slipped outside and carefully lifted the little birdy back into the nest and backed away.
It was like a movie director called 'ACTION!' because immediately the parents hopped into the nest and started feeding their kid.
That began what became a really fun relationship. I never treated him like a pet and he never acted like one. He learned to fly, started roosting out at other places with pigeons, but every day he'd show up and hang out with me, he'd fly into my office and perch on my head or my monitor and watch me work for a few hours before taking off and going back to doing what birds do when they're not hanging out with me.
I often wished I could put a little camera on his head so I could see where he went and what he did but really, I loved that I had a wild bird that hung out with me.