I have seen these on Pinterest, and thought they were funny. The Oxford Comma is a big controversy. Whether or not to add a comma in a list of items before the final and. I was once told, by a teacher, that at one point it was expected, but it is no longer important. I’d have to agree to a certain extent. It isn’t as grammatically incorrect as saying ain’t, but it still isn’t grammatically correct.
Show your students the photo with the breakfast food (the other is provided for a laugh). Ask them what they had for breakfast, to write down that sentence, and then show them the picture. Ask them, according to their sentence, which they had, if they had orange juice on the side, or on their toast.
*Unable to find originals. They can be found through google images by search Oxford Comma.