At work recently, we had some fun with this after receiving a writing guide that instructed us not to use the Oxford comma.
Commas truly change meanings.
"Eats leaves and shoots?" or "Eats, leaves, and shoots"?
Commas even save lives.
"Let's eat Grandma!" or "Let's eat, Grandma!"
Recently, a company was forced to pay a considerable amount of backpay to drivers as a result of a lacking Oxford comma. Lack of Oxford comma costs Maine dairy company $5 million
Moral: Never be afraid to use a comma.