Emergency oxygen system, the flight attendant, and the passenger safety demonstration.
On April 17, 2018, Southwest Airlines Flight 1380, despite flight attendants performing the pre-departure passenger safety demonstration, it was evident passengers did not pay attention based upon the emergency, a decompression, they would experience later in the flight. They experienced a rapid decompression during cruise flight flying from LaGuardia to Dallas, diverting to Philadelphia. A passenger seated next to the damaged window was pulled partially out of the airplane. Thankfully, there were passengers next to her that attempted to save her and bring her back in. Unfortunately, the female passenger passed away despite efforts to save her.
What happened was an outlier of an event, aircraft engines are designed to contain engine failure, but something went wrong which caused shrapnel to fly out of the engine and strike the aircraft, a piece of it striking the window, causing it to shatter and initiate the decompression. Flight attendants receive training on decompressions, and although they are very rare, they can and do happen. Considering it was a window that flew open and not a section of the fuselage, experienced a rapid decompression where loose objects throughout the cabin may fly towards the opening, however it does have a direct impact on the person seated next to the damaged window, which is to attempt to pull the person out. All details regarding what happened are not available yet, so to say anything early would be only speculation. What can be said is that flight attendants do need to know and understand their emergency procedures in the event something like this happens. All that we do know is that the flight attendants, flight crew, and the passengers who tried to help save the now deceased woman all did their very best considering the circumstances. The crewmembers did exactly as they were trained to do in an emergency, and for that, kudos to the crew.
Photos from the event also revealed that passengers do not pay careful attention to the safety briefing.