Heero: Because Wing Zero told it that its future was on the other side

Duo: Hmm... (GULP) What chicken? (BURP !!!)

Trowa: Because it saw my clown act

Quatre: Because chickens are heavenly creatures

Wufei: Because all chickens are women and women are weak

Treize: Because the chicken had honor

Dorothy: Because it went off to start a beautiful war