A tiny selection of the flavor compounds in pumpkin and pumpkin-pie spices is enough to make our brain think, "Ah, pumpkin pie!" when we drink a pumpkin pie latte. Ashley MacKinnon/Flickr hide caption

itoggle caption Ashley MacKinnon/Flickr

In some parts of the U.S., Starbucks is testing a latte flavored with roasted-stout notes along with its seasonal autumn drinks such as the Pumpkin Spice Latte, seen here at front. Starbucks hide caption

itoggle caption Starbucks

A pot of tea sits at the newly opened Teavana tea bar in New York City. Spencer Platt/Getty Images hide caption

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In India, Starbucks will have to compete with this locally-owned coffee chain, Cafe Coffee Day. Aijaz Rahi/AP hide caption

itoggle caption Aijaz Rahi/AP