My uncivilized hooligan former neighbors had a young tree in their yard which they purposely allowed to grow for years right in the foundation of our brick wall. It started casting a shadow in our garden as well. There were no nests in the 20 foot young tree and the property was abandoned and now owned by the bank. So I ran over and cut it down. It was big enough to start cracking the foundation.
Big mistake, I should have worn a disguise. The crows who live in the tree above the one I cut took saw this as vandalism (well it technically was). For 2 weeks they would poop on my car non-stop. Only my car. They knew the PT Cruiser was mine, they shat all over that car. They specifically aimed for the door handle on the driver's side. I have never seen such vengeful birds and such nasty bird crap. It was discussing. They'd carpet bomb it all day, every day, for 2 weeks. I would have about 14 bird crap splatters on the car on any given day. They finally stopped after about 2 weeks.
I should have had a neighbor do it or worn a disguise.