Saw a video of a simulated explosive decompression once, was above 40,000 but can't remember exact altitude. The guy knew it was coming and had passed out before he had the mask on, all he had to do was reach up, grab the mask, pull it and put it on. He got about as far as stretching the elastic about to put over his head when he passed out and the safety guy already in a mask had to finish putting it on for him. Would love it if they did show that sort of thing as has been suggested above about showing a realistic video. Would probably freak a lot of people out if they knew what it can be like especially because the pilots are in the same plane also without masks on.