Tonight, my friends and I were at a restaurant and I put a sealed-up creamer package in my water glass, and I was just drinking it, lalala, and then the waitress came along and started to give me a refill, but she saw it and said, "Oh...there's cream in here." And then she didn't refill it! =O

Is there a rule I don't know about that if the customer puts a creamer package in his/her water it means he/she doesn't want a refill? =P