I was at an ocean conservation conference a couple years ago and heard this story. The speaker was on a week-long dive trip in Australia back in the 1960s, when dive certification was relatively new and uncertified divers much more common. The boat captain asked to see everyone's certification cards, and the speaker did not have one. He told the captain that his father had taught him to die when he was 7 years old, and he had done thousands of dives since then. No dice. If he didn't have a card, he couldn't dive. He could just sit on the boat all week and reflect upon the fact that wasted time.
Luckily for him, crew members intervened, and the captain finally agreed to make an exception in this case and this case only. When he returned to the USA, he went to the local PADI shop and got a certification card so he would not have to go through it again. He was still carrying that card when he spoke.
His name was Jean-Michel Cousteau.