Saved from a self-wasing public toilet

Currently traveling in Aquitaine France and have only been here 2 days. Twice, once yesterday and once today, I have saved a tourist from walking in behind me in a public self-washing toilet.

Yesterday it was a German tourist, and she didn't speak French. My daughter who speaks a little German tried to tell her not to go in but she didn't understand. So I insisted in English, which she understood a little and finally let me shut the door. When she heard the whoosh of the water from the inside, her eyes went wide and she realized we saved her from a huge mistake. She thanked us a lot after realizing her near miss.

Nearly the same thing happened today when an Asian girl tried to go behind us in Saint Emilion. Lucky for her that her friend spoke English and understood and prevented her from going in.

Twice can't be a coincidence, so my question is how often do people actually get stuck in these during the toilet wash cycle?