Demi Moore and Ashton Kutcher must be feeling awfully secure in their marriage, because they've embarked on a journey that would make lesser couples snap (at each other and any available foodstuffs). Over the weekend, the Twitter-loving pair revealed they're doing the so-called Master Cleanse, a deprivation-centered diet that involves drinking a concoction of water, lemon, maple syrup and cayenne pepper. Yummers. When someone pointed out that it's a "sad day when 2 gorgeous people have to suffer to stay that way," the super-svelte actress explained that the cleanse is "about health," which seems like a specious argument when you're getting your daily nutrition in spicy liquid form. As for Demi's lanky hubby, he was less concerned with purifying his system and more interested in raiding the fridge. "9 hrs into the master cleanse," Kutcher wrote on Saturday. "I want a steak, a beer, and a blow-pop. Hmmm this is gonna be rough."