Wow, did phychocabbage push the wrong buttons.
I might be able to help here.. because:
1. I am a NAUI instructor.
2. I have have lots of OOA experiences with divers.
Note: Not in recent years, but back in the J valve days, I was the only one with an octo and doubles.
So, to some of his points:
First off, anyone can panic... anyone. You might be able to control it, but anyone that believes they would never do it is wrong. Actually, the "I don't panic" people are the most dangerous.
Second anyone can have an OOA situation. I have never had to get air from another diver, but that is just luck. I have had my second stage break (the spring holding up the inlet valve) and empty my tank and had a regulator come apart.
Third, ok I admit it, I have told the knife joke in classes.. it was a joke. Just learned something here and will never, ever use it again.
Fourth, Every OOA situation I have been in, the person was not my buddy, and they did not ask, they took my primary. Once from behind, with my octo on the side of my doubles, in their plain sight.. they still reached over my shoulder and grabbed my reg... choking me in the process.
Fifth, your wife can free dive down 20ft...any good free diver can do 60, with a lot of bottom time. As with anything else in life, it depends on your point of view and experience.
While I think this thread has had way too many personal attacks in it, it is wonderful to see the number of people that have defended doing the right thing. I was going to thank everyone, but that would be about half the posts.
One last note: Please ask your instructor what he thinks of your "I don't share my air with anyone but my family" attitude. I know I would put that in the category of "people that should not be diving"