Nuns devise a kneecap torture
Normally reserved for those of us caught smoking in the toilets, it involved scraping gum from the floor with a rusty penknife and depositing it in a shared receptacle, thus requiring us to shuffle about a lot on our knees. I still have the scars. I still haven't managed to stop smoking, either, but have an enduring horror of chewing gum."
She doesn't say how this activity affected her attitude to prayer.