What is an example of a student handbook rule that has a necessary oxford comma?

Here’s an example sentence to help show why I think the Oxford comma should always be used, wherever possible: -

- I like Ziggy Stardust and The Spiders from Mars, and Tom and Jerry.

This could be ordered, as suggested above for non-advocates, to:-
- I like Tom and Jerry, and Ziggy Stardust and The Spiders from Mars.

But may not be reordered to: -

- I like Ziggy Stardust, Tom, Jerry and The Spiders from Mars. 

yes

explanation: