I found some extreme diets that I don't think sound very healthy...
The Master Cleanse - Also known as the "lemonade diet," it is when you drink nothing but lemonade, maple syrup and cayenne pepper for 7-10 days. Umm...no thank you.
The Baby Food Diet - Exactly as it sounds. You eat nothing but baby food. Maybe if I get to use the spoon that is shaped like an airplane.
Ketogenic Enteral Nutrition Diet - This one you have a tube ran up your nose for 10 days as a liquid mix of protein, fat and water is fed directly into your stomach. I wonder if that would be very noticeable?
The Cotton Ball Diet - VERY DANGEROUS! You eat cotton balls to stay thin. Buddy The Elf did it but that was a movie...and he was an elf.
I don't think any of these are a good idea. At all.