Here’s the thing about habits and rituals: They are enormously evolutionarily advantageous. We are cognitive misers; making decisions and remembering things take energy (which is finite), and forgetting things can be very costly–even deadly. So, we’re primed to form habits, because they offload this effort. The productivity books and blogs are full of anecdotes about Famous Admirable People establishing rituals to free up their headspace (e.g., Einstein had a closet full of clothes that all matched and never wore socks; he could just dress at random without putting effort into choosing garments).
Any task that you can initiate in under two seconds[1] is not perceived as requiring effort; it easily slips into habit and automation: Putting on a seat belt, switching off a light, grabbing some M&Ms from a bowl on someone’s desk, glancing at a cellphone.[2]
As this little list makes obvious, there are up and downsides to this mechanism, as an unhealthy or downright dangerous habit can form and ossify just as easily as a good one.
So, I love that this guy’s nail-polish hack–by creating a consistent distraction–effectively increases the cognitive effort of the habit up beyond the threshold, so the automation falls. Maintain this consistent cognitive load, and the habit softens up and becomes far more susceptible to modification.

