You know you're an otaku when you appreciate Konata's version of Cha-La-Head-Cha-La and Uchuu Tetsujin Kyoudain.
http://www.youtube.com/watch?v=0MGeRSwIQKE&mode=related&search=
Cha-La-Head-Cha-La ~ Aya Hirano as Konata Izumi
http://www.youtube.com/watch?v=3jF-AQAtq4Y
Uchuu Tetsujin Kyoudain ~ Aya Hirano as Konata Izumi
Bonus points if you can sing Motteke! Sailor Fuku too.