I proposed this very thing to Brad. Seriously, they would so remember your defense if you went in with a tambourine.
My dear husband is defending his thesis this week. We have been married for almost 14 years, and almost all of those years can be marked in semesters. He has done 2 Masters degrees and now a PhD. All of this momentum will hit a wall the end of October. We've labeled his grey hairs affectionately with each step of this degree.
I am so amazingly proud of him. We.made.it.