A passenger aboard an Air Canada flight from Toronto to Dubai opened a cabin door before takeoff on Monday evening, injuring themselves and causing lengthy delays.
He knew that he was willing to help in the case of an emergency, but needed to double check that he was able before the stewardess came around and asked.
Good thing he checked too, because it turns out that no, he would not have been able to assist in an emergency. Well, other than opening the door and promptly falling out.
Didn't Douglas Adams write a bit around that in one of his books? It says, "Warning: Do not look into laser with remaining eyeball," or something to that effect?