A while ago I bitched and moaned about the Oxford Comma, and Strunk & White getting it wrong.
Well, I was wrong. I am looking at page 2, top of the page, and it clearly says that one is to use the Oxford Comma (as I just did) to avoid the obvious pitfalls of being an ass.
To whomever I disagreed with, I've no looked it up and you were right! Sorry, it was a few days ago and I just got my S&W out.