From the moment Mom sat across from me, I knew where Diva got her attitude. Mom was belligerent, accusing, and rude. She began to angrily accuse me of causing her daughter to fail (somehow my fault?). Basically, I should have done everything under the sun to make sure she didn’t fail: I should have contacted her early, I should have sent home extra copies, I should have been checking Diva’s agenda, etc.
While I admittedly should have called her early, her chewing me out in front of my boss was the most embarrassing moment of my career.
However, any principal I've worked with also knows this about the parents, so they put on a show to calm the animals down but trust you to do something to try shutting them up next time.