We had a timber outback behind our house, and I threw a rock at a crow once. From then on, if it would see me, it would follow me and buzz me sometimes.
There was an artist who took care of a family of crows, bringing their child back to their nest when it fell out, leaving food out for them during the winter. Once, he found a tree branch threaded onto a metal ring left where he would find it. Crow art work in gratitude for his friendship?