In an episode of Animal Planet's "The Vet Life," an animal hospital's three veterinarians are about to film a video of themselves promoting their facility. Dr. Blue suggests doing some vocal warm-ups first and starts saying, "Red leather, yellow leather." His coworkers, Dr. Ross and Dr. Lavigne, decline to join in.
In seventh grade vocal music class, we started the year by learning vocal warm-ups, such as "Red leather, yellow leather, good blood, bad blood." I was at ease saying such gibberish in that class. It made sense in the context of the class, and everyone in class was saying it. Outside of that class, however, I would have felt downright silly saying such things. I'm sure Dr. Blue had good intentions, but I can understand the other
doctors' reluctance to say, "Red leather, yellow leather," at
work.
