I'd do another Cortana advert, I don't see why not.
You can be a Polish American, or an Arab American, or a Greek American but you can't be English American. Why not?
We have escapist fiction, so why not escapist biography?
I mean, if cans can be recycled, why not spirits?
If you have ability in a certain area, why not capitalize on it and improve it and use it?
Why not just eliminate the federal income tax?
Why can't we be Greece in the Euros? Why can't we be Leicester in the Premier League? Tell me why not.
Why not aspire to build a real Jurassic Park?
Why not question what can or can't be a layer in layer cake?
Will I obliterate national debt? Sure, why not?
Why not whip the teacher when the pupil misbehaves?
Gooseberries should be mainstream berries! Why are chemically fattened strawberries a thing? Why not the delicious gooseberry?