When Did "Starbucks" Turn into a Noun?

I flew from NY to San Diego this week and in between charging me for a crappy sandwich, the stewdaress came around serving coffee. What she said was interesting. She said "Starbucks... would anyone like Starbucks?"

Then she said...

"Coffee... would anyone like a Coffee?"

It was odd was how she alternated between "Starbucks" and "Coffee" - like she was conducting some bizzare Pavlovian experiment.

She litererally rotated back and forth between "Starbucks" and "Coffee" the entire way down the plane (or at least as far as I could hear). It made me wonder if she was actually scripted. Could Starbucks be trying to subliminally condition us or has it already happened?

On the other hand.. here's Tivo's take.