Fumie? I'll say. I once saw a variation of this in a Japanese nunsploitation movie (really) where a nun was made to drink, tied up sitting in a chair with a fumie-type device between her feet and then left to have nature take its course - the reasoning being that no true nun could pee on the image of Christ and that she must therefore be a witch.

Ah, religion.

Edit: 22/4/10 Kotaku asks: 'What's with the nuns, Japan?"