Logan Warren, a 22-year-old tech entrepreneur and student, can't afford to drink at the coffee chain daily. "At the rate I consume coffee, I'd be a pauper in a month," the Texas-based college student tells Shine.

So when he landed a coupon for a free drink, of any size with any additional add-ons, for his birthday (a company gift if you sign up for their rewards program), he took it as a personal challenge. What's the biggest, priciest Starbucks drink money can buy?

It all starts with a Trenta, the super-sized coffee cup introduced by the company last May.