Comma, comma, comma

I have a bit of an advantage this week. I took media writing a couple of semesters ago, and I've become very familiar with AP style. My biggest pet peeve with AP style is that the Oxford comma, also known as the serial comma, is not used. The stylebook states, "In a series: Use commas to separate elements in a series, but do not put a comma before the conjunction in a simple series: The flag is red, white and blue. He would nominate Tom, Dick or Harry. Put a comma before the concluding conjunction in a series, however, if an integral element of the series requires a conjunction: I had orange juice, toast, and ham and eggs for breakfast. Use a comma also before the concluding conjunction in a complex series of phrases: The main points to consider are whether the athletes are skillful enough to compete, whether they have the stamina to endure the training, and whether they have the proper mental attitude."

It seems that, in the grammar nazi world, you're either strongly for or against the Oxford comma. I am strongly for it. The Oxford comma allows for clarity and parallelism. Just for fun, here's an infographic I found on Pinterest about the Oxford comma:

For my typo this week, I found this sign posted at my office:

The typo is in the first sentence, which should say, "Depression is a complex, serious medical condition that causes changes in thinking, mood, or behavior."