Great tits visit me once or twice a year, often in pairs, usually in October/November. They see crank open window (opportunity) and lush green inside (incentive), but once they get in, they can't get out. When I hear them, I just open balcony door and try to direct them there, but in the meantime they often ram the windows. At least on one occasion it sadly ended with fatality.

In my bedroom

This one got stunned after trying to fly through the glass.