Well, it has little to no effect on the person reciting the phrase
(right? So I've noticed anyhow.). I think it may just be a speech pattern
picked up, but it may effect some people. Ever get scolded for saying it
when you were 5? It could have some effect, but I see it more as something
repeated with very little effect (or maybe everyone is immune from
overexposure?).
Or maybe it is exploiting that humans will mimic speech?