From Coudal via John Gruber comes this list of common non-errors in English. The first item on the list is split infinitives, and of course they give as an example the most famous split infinitive in Modern English: “… to boldly go where no man has gone before” (to give it its original, non-PC reading).
I can’t be the first person to notice that this phrase is (nearly) in iambic pentameter, which is the standard meter for blank verse in English. So “correcting” the grammar ruins the poetry of the phrase (such as it is), but I rarely see this pointed out. Both William Shatner and Patrick Stewart were classically trained, so they must have noticed…