How to thwart a 'Qian Bian Wen Da Ti'...

(Roughly translated from Chinese dialogue)

TF: "EH! Ask you this question: Why does penguins have a white belly but is black everywhere else?"

YH: "Dunno?"

TF: "Aiyah, you're not even making an attempt to guess!"

YH: "Oh I know! It's for camouflage purposes! Fishes beneath the swimming penguin will see white as the sun shining through the water, while predators above the water will see black as the depth of the water below!"

TF: "Eh, this answer seems correct hor, but why so scientific one! No la, it's because their fins are short so they can only rub their bellies when they bath!"