potato chips made with fat-free fat (olestra)
http://www.wisegeek.com/what-is-olestra.htm
ya gotta love food that lists side effects:
"The side effects—including loose stools, abdominal cramping, and olestra's interference with the body's ability to absorb certain crucial vitamins, namely Vitamins A, D, E, and K—were enough to cut sales in half by 2000 to $200 million USD. Although the intestinal side effects, which became commonly known as "anal leakage" "