OK, I think people are going overboard on the Cameron Diaz story.
First of all, comparing the grouper to a Volkswagen is a literary concept that has been called
hyperbole for thousands of years. It is exaggeration to create an effect. The speaker never intends that the listener is going to believe it to be an actual attempt at an accurate description.
Next, signalling that you should pet it can be easily accomplished by pointing at it and making a petting motion.
Finally, notice that the word "oxygen" is in parentheses. That means she didn't actually say it. Whoever wrote the transcript added it in the theory that it was making things more clear.