I saw it done on a farm in France some years ago, which was where I first heard about the idea that foie gras was a horrible animal-rights issue. He's quite right that the ducks don't mind. You've never seen a healthier flock of birds than the ones ten days from slaughter on that foie gras farm.

I believe the general consensus in France now is that American activists need to stick with their McDonald's and stay out of issues involving real food - since they clearly know nothing about it.