Lifehacker bravely read Starbucks' Terms of Service and reports that you can get free refills on certain drinks. This is news to me.
According to the company’s website, to qualify, you have to have purchased your original drink using the Starbucks app with a Starbucks card connected to your account. You’ll have to present this to a barista to obtain a refill.
One other thing: if you leave the store, the deal's off.
(Just for fun, I'm using this photo of a Starbucks in Kyoto. I went there when I was in Japan last year, and it's by far the coolest Starbucks I've been to. See more photos here.)
Image: Starbucks in old town Kyoto, by f11photo/Shutterstock