In 2009, I had a similar experience at Pop Century. I asked if the 20% off applied to the mug too. The CM said, "we'll see"...and it took it. However, the next day, my friend decided to get a mug too. When we paid (we combined our bill so that she could share in my discount), that particular CM said that the discount did not apply to the mug and it would have to be rung up separately. So, I guess it depends on who you get. I *believe* that the discount is not supposed to apply, but it is up to the CM as to whether or not they will allow it.