For the last couple weeks or so, there's a bat that somehow managed to sneak in and hid somewhere in the house and then flew frantically in the living room every evening around this time of the day, causing the cats to run and jump around trying to catch it. We caught this bat every time and delivered it outside, hoping it would never return again. But it kept coming back. Now I am sort of giving up trying to catch it. Even the cats are no longer paying attention to the bat and just give this "meh" face when they spotted it.