Now here's a crackpot idea I can really get behind: Breatharianism - the alleged ability to live without food. It's believers contend that the human body can survive solely from the energy in sunlight.
What I find particularly intriguing about this is Breatharian founder Wiley Brooks (above) and his recommendation that aspiring followers adopt a diet of McDonalds Quarter-Pound cheeseburgers and Diet Coke to prepare for a life of eventual non-eating.
Brooks, according to Wikipedia, "was allegedly observed leaving a Santa Cruz 7-Eleven with a Slurpee, hot dog and Twinkies" in 1983.