Maybe but keys are already convenient and no training.

Well that was sort of my point, is that, despite the ease of access to this kind of idea, I’m pretty sure that, even just on the smell test, the “keys between the knuckles” strat wouldn’t really work. It strikes me more as something that might feel good to do, something that might assuage the kind of, passive anxiety, rather than being a good preventative measure.

Also, what do you mean by “the whale” in their life? I’ve never heard of this metaphor before.