Definitely not something that makes me laugh as I got stuck in airplane bathroom when I was three. Mom let me go by myself because it was only a few rows away, she could see the door, and I'd never had a problem (been flying since I was a few weeks old). Well it was my first encounter with a bifold door, I got in there and was too short to see the instructions on how to unlock & open the door. Apparently my screams for "Mommy" had half the plane running for the lavs. Once mom got there she talked me through opening the door, but still, to this day, I try and avoid using airplane lavs if at all possible - lingering trauma from when I was a child.