I heard this phrase on the radio again today, and its earnest presenter assured me that a local grocery store's pharmacy offered customer service that is second to none.

Oh, really, I thought; so the customer service presented by the cut-rate employees of the discount chain are actually not as good as when the store offers no customer service at all? I mean, that's what none is; it's the lack of the very thing offered, and when you say you're second to none, that doesn't mean that you're first; it means that you're lower than nothing at all.