You know, I thought that shampoo ad was going to demonstrate that "rinse and repeat" was just an effective marketing ploy. 😀
From the other side of the couch, so to speak, the results relating to procrastination are of some interest. With 25-ish years of experience, I can confidently say that the onset of wide-spread procrastination is a correlate (with the usual distinction from causation) to an onset of a depressive episode. Similarly qualified, a reduction in procrastination almost invariably heralds an abatement of such episodes.