It is in the episode where Rosenne is visiting her parents and the one lady is keeping an eye on the kids and the house. She takes out a glass and milk. She pours it in but when you see the glass the milk is orange. Either it is bad or someone really screwed up at the milk/ juice company!
We used to have glasses just like the ones they had on the show, they were red, and if you put milk in them it looked orange. Also they use the same kind of glasses at Pizza Hut, or at least they used to, maybe they don't anymore.