The Law of Inaccurasy

Recently I've seen a new example of what I like to call the Law of Inaccurasy. The Law of Inaccurasy states that the more a statement is about accuracy, attention to detail and professionalism, the more likely that statement is to contain some bloody obvious spelling error or grammatical mistake.
Case in point: a notebook I bought recently, which bore the following sentence:

Succes is in the details.

The fact that I bought it in a non-English-speaking country might explains something. But imagine my surprise when I googled this sentence and found two hits, neither of which was ironic.