This happened at Star Tours.
The gate agent was doing seatbelt checks. A lady had her backpack on. The agents asks her to take it off and put it under her seat.
The lady looks tremendously confused and says “baby under seat?”
She takes off the backpack and turns it around and LO AND BEHOLD there is a BABY in there. It was one of those backpack carrier things.
BUT THEN SHE STARTS TO PUT THE BABY UNDER THE SEAT.
The agent was like “NO NO BABY NO BABY UNDER SEAT” and got her out of there. I think she was still confused.