Thought the thread title meant something else? Well, here's my own door opening incident.

This past summer, I was on a WN flight from SNA to SJC seated in my preferred seat, 1D. I had a clear view of the exit door. During our flight, a female pax walked up to what she thought was the forward lavatory and started turning the handle. I saw her out of the corner of my eye and thought, "That's funny...isn't that the..." Then I realized what she was doing and I yelled out, "Um...hey..."
Apparently a few other people in the front rows saw this and started getting the woman's by shouting at the her. The woman looked at us and then looked at the exit door and realized what she was doing. The FA came out of the galley and stopped her and showed her the correct forward lavatory door. We all had a laugh when she exited the lavatory.

The FA said nothing would happen since the plane is in flight and the doors lock, the handles are disengaged.

Only on a WN flight....

Steve