That was kind of the point. The variations on twat answers are either:
a) The poles thing (although a lot of penguins live places like south america, the galapagos)
b) "Because they can't get the wrappers off". This is supposed to be amusing because Penguin was/is the name of an individually wrapper chocolate biscuit thing sold in the UK.

To turn round and say, "Actually, they do" and show them video of a polar bear eating a penguin would be more amusing.

Or, if it turns out that there is some undiscovered reason why they don't then the footage should reveal it.

I'm English, and as such I crave disappointment. - Bill Bailey
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