Wendy's narrowed the vanillas to two varieties and brought more than 100 consumer testers into stark white tasting booths at its head headquarters. The testers were told to take at least three bites of each sample before deciding which they preferred. They picked the sample with the stronger cotton candy flavoring. But a few said they didn't like the idea at all. "Vanilla is just not Wendy's," one tester wrote after sampling it. Since Wendy's launched the vanilla frosty in July, Frosty sales have increased 25% (Based on: Janet Adamy, "Why No.3 Wendy's finds Vanilla So Exciting," Wall Street Journal April 6, 2007.)