I actually went to a Jesuit seminary school for my first eight years, and then Catholic high school following (Mountain View, CA, up in the SF/Bay Area).
Waterboarding would have been child’s play for the nuns I had. They were a Carmelite order and most of them were from Ireland. Tough bunch.
The funny thing is this: I received a stellar education and I would kill for that sort of discipline in my kid’s classroom today.