So the strangest thing just happened. I was sitting on the couch downstairs working. The birbs were hanging out in the cage in the kitchen. Blinds were closed with curtains drawn so nothing to see outside. No shadows. No loud noises. Absolutely nothing happened that would trigger them. I have heard them freak out before too due to one of these external stimuli. Usually they get a little excited for 5 seconds, make their high pitched alarm call and eventually freeze silent on a perch somewhere or migrate back to the nest and hide. Whatever just happened a few minutes ago was something completely different. This was like 10 minutes of pure terror!!! I think Charlie started it which got Emma out of the nest. They both were flying about recklessly and not making their usual alarm call, but instead, the highest loudest and most frequent sound their little bodies could muster. To the point of them losing their little voices. I ran over to the cage to see what was going on. Emma eventually stopped and perched on a branch, but Charlie just didn't let up for a few more minutes. I finally managed to calm him down and get them both out of the cage so they could chill and munch on some millet. All is back to normal now (Emma returned to the nest and Charlie is hanging out on the playstand), but WHAT THE HECK HAPPENED??? It's like he saw a ghost lol.