Even if air travel is deemed safe and every safety measure has been undertaken, accidents may still happen as airplanes are still man-made objects defying the laws of gravity and susceptible to nature's wrath. Anything can still happen especially during take off and landing. This is the reason why you have cabin crew members on board, so incase the unfortunate happens, they are able to get you off the ill-fated aircraft blemish free as much as possible in less than 90 seconds.
Safety is indeed a two-way thing, it also needs the cooperation of passengers. Your cabin crew can only do so much, especially when one becomes too unruly or hard headed. Despite us being used to seeing the safety demo and being briefed all the time about the emergency exit doors, we tend to forget things during an actual situation. So here are very important reminders what to do when the unthinkable happens.
During an emergency, the cabin crew has to get everyone out in less than 90 seconds. Every second counts. Also, please do read the safety cards and study them. Do always pray for a safe flight but also be prepared for the unexpected.