Sometimes, even the best marketing executives stumble and make simple English mistakes. Below is a promotional poster for the release of a Harry Potter book.
See if you can spot the error:
The most creative marketing text is made foolish by the simplest errors. The lesson for everyone is: Always proofread your texts. Get someone else to do it as much as possible.
If you need expert proofreading, let me refer you to our Proofreading Services page.