When I first studied to take the Tax Court entrance exam, it was stressed that I would almost certainly never see any "Perry Mason moments" in a Tax Court trial.
That being said, while attending a trial session locally, I recall one petitioner (a doctor caught up in a bogus tax shelter scheme) have a complete meltdown during direct examination about how he his home and computers were secretly bugged by the IRS and how revenue agents were seen jumping over his backyard fences trying to gather information on him.