Lucky☆Star - episode 3 - 21 Apr, 2007

The girls discuss various facts and myths about twins, and how, according to changes in classification, Kagami and Tsukasa might be identical, instead of fraternal. Then, Konata, Tsukasa and Miyuki compare notes on marriage. Later, when Konata, Tsukasa, and Kagami are hanging out together, they each pull their hair into a ponytail to see how it would look. In Lucky Channel, Minoru re-introduces Miyuki Takara. After a short list of Miyuki's good attributes, Akira gets more than a little jealous of her attractiveness. (Source: Wikipedia)