Advice for the PhD defense from examiners

I’m currently co-authoring a book about the PhD defense, and one of the points we are covering is advice for the PhD defense from the point of view of the examiners. The majority of testimonies in the “PhD Defenses around the World” are from former PhD candidates. Some of them have added a paragraph reflecting on how they now examine as a committee member, but the point of view of examiners is underrepresented. So, I turned to Twitter to ask for the best advice from committee members. I’ve collected the answers in the wake below: