WOW! Chips (Olestra)
Fat-free Lay's, Ruffles and Doritos that tasted like the real thing, and a warning on the bag that they "may cause abdominal cramping and loose stools." Frito-Lay's WOW! chips went national in 1998, sold hundreds of millions of dollars' worth in a year, and became the 90s snack everyone remembers for what happened afterward.