Heard recently on the news about a woman who weighed in around 400lbs (181.82kgs) some time ago. She decided to lose weight, but didn't do your typical diets.
If I remember correctly, she puts 1400 calories in a bag, and gets to eat what's in it only. Once the bag is empty, she waits until the next day to eat.
She didn't cheat, and now weighs around 130lbs (59.09kgs), if memory serves. I have no idea how long this took.
I like this kind of diet, its so simple, anybody could do it. I'm planning on starting ASAP.