So fascinating!
There is a young girl in Seattle who made friends with the local crows by feeding them, they soon were bringing her regular gifts in exchange for her snacks - http://www.bbc.com/news/magazine-31604026
I tried to do the same thing in my backyard for about three weeks until one day my wife caught me putting little pieces of bread on our porch railing. She asked what I was doing and I explained making friends with the crows (what else?!). She asked me to stop so I did.
My only hope is that they attack her now and not me, with some level of understanding that she was the one who ruined all the fun...