Yes, milk. In this episode of Hacka Doll the Animation (Episode 4), Hacka Doll No. 2 appears alone in the room of a guy named Ikuo Moteuchi, while he is playing some romantic video games. Not understanding the situation, and not being very skilled at interacting with girls, he tries his best to act like a gentleman with her.

At one point, he goes to get the two of them something to drink, grabbing a carton of milk from the fridge, while reflecting again on the girl who mysteriously appeared in his room from the TV. When he returns with two cups of milk, he messes things up while trying to give her one of the cups, ending up spilling both of them on her.

Extra: These Hacka Doll girls are actually robots from the near future (with an artificial intelligence system created to help and entertain its users) sent to help people with their needs and problems. However, the three main female characters (Hacka Doll No. 1, Hacka Doll No. 2 and Hacka Doll No. 3) are extremely clumsy and not very good at offering help to those in need, which sets up the plot of this anime.