I don't know if anyone's started this before, but I'll give it a try.
You will have two choices of things to do/eat/etc (both should be equally extreme/gross/hard) and you choose which one you would rather do depending on the choices the person above you gives. Once you choose, make up another 'would you rather..." question for the next person.
ex. What it will look like...
1st person: Would you rather...eat all ten of your fingers OR be locked in jail for 10 years?
2nd person: Locked in jail for ten years. Would you rather...lick a hobo's foot OR a monkey's armpit?
And so on...
Would you rather...eat fourty pounds of raw meat OR give up bathing/showers for three years?