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As the salty snack that helps you "Do What You Do," Wheat Thins new commercial features Stewie and Brian from "Family Guy" doing exactly what they do best: fighting. The spot pays homage to Stewie's ongoing difficulties with a certain pronunciation.
If you watch this video, you understand the origin of the "WHh"
http://www.youtube.com/watch?v=-ScyVd-hXNk