A slightly "folk processed" anecdote from another context:

Waldo Doofnagel is traveling on a jumbo jet flying over the Atlantic and he notes that the elderly gentleman sitting next to him looks quite familiar, but he can't quite place him. He opens a casual conversation with him and discovers that he is a world famous pianist that he has seen a few times on television. He is still doing concert tours.

In the course of the ensuing conversation, Waldo learns that this august keyboard virtuoso still practices four hours a day, every day. Same comment:   "You still practise after all these years?"

"Of course," says the pianist.

"But WHY?" asks a mystified Waldo.

"Well, let me explain it this way:    what do you think our altitude is right now?"

Mystified at the apparent change of subject, Waldo answers, "Well, I don't know. About 35,000 feet, I think."

"That's high enough!" says the pianist. "Tell the pilot to turn off the engines!"

Don Firth