Someone posted a video of a flight in a twin where the door popped. Good video because you get to see how the door was closed as well as when it popped. Lots of hurrahs in the comments about keeping cool after the door opened in flight. But, it seems nobody notices the pilot error that led to it in the first place. The PIC did not close the door, the passenger did. Furthermore the PIC did not use a checklist or verify that the door was properly closed. I don't care if it's a friend, fa