I'd gotten interested in lean, aka sizzurp ... and its fans prefer to drink it out of big double Styrofoam cups. But something caught my eye amidst all those 'grams: a special double cup that ...

Lean, also known as purple drank ... Originating in Houston, Texas, it’s typically served in a white Styrofoam cup. Here’s a look at what’s going on behind the Styrofoam.