Yukari: *throws cake to the ground* Happy birthday..... TO THE GROUND~! What you think I'm stupid?! I ain't apart of your system! I'M 17 YEARS OLD! DUH!
I have a new one: Yukarin's age is to be expressed within 2^17 number (in other words, it can be expressed with 17 candles, where some are lighted and some are not.
For example, 11111111111101110, where "0" stands for not lighted candle.