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Hmn, the other day I started to descend, and in the first 2 feet, sucked a bit of water in through my regulator. But I didn't choke (I was happy about that -- i wondered what my reflexes would be if i suddenly got water instead of air), and I pondered for an instant that somehow i must have forgotten to turn on my air. In the next split second, the other half of my brain said, "then you'd be sucking against resistance, not getting water. Think of something else."
It was at that point that I realized I still had a snorkel in my mouth, pushed up to the surface, and switched to my regulator... (My air was on, of course.)
I guess that counts as 2 things: a brain fart, and getting water in your mouth...
And... of course..... the critical factor being that 'in the olde days' divers received much more comprehensive and robust training
And some of us received no "comprehensive or robust training" before entering the UW realm; I purchased my first cylinder and reg from a local hardware store long before YMCA, PADI and the rest of them.
The 'olde timer' might not have required specialist solo training, but his modern McDiver counterpart most certainly does.