This. This is the reason we have screens on windows back home, and why I feel all of the British Isles need to get behind them too. Scout seemed agitated about something in my bedroom, so I opened the door to find this little fellow, a great tit, inside the house, slamming himself against the window in a desperate effort to get out. After pausing to capture photographic evidence, I slowly advanced to the window, sending him into an absolute frenzy, opened it wider, and made encouraging noises in hopes he would find his own way out. Which he did. I was lucky; when this happened to my neighbour, the bird at her house committed a series of panic poops, all over everything.
Screens, people. Screens.