What would be your most questionalbly-ethical billionaire secret project? Not "pay off my friends' mortgages" or "end world hunger." Knock it off, that's not questionably-ethical. Me? I'd probably sequester 50 scientists on a secluded island and pay them to insert the FOXP2 gene into some chimps.

I WANT TO EAT A WOOLLY MAMMOTH!!!

I would hire someone to send a fresh, brand new pair of white socks to a random address in the world every day. The return address would be another randomly chosen address.

Kill off dangerous leaders, but in a way that would be completely natural, and on-camera so conspiracy nuts had nothing that anyone would believe.

I'd ban golf.

Whoosh! For me

I would commission a shot-for-shot gender-swapped remake of Braveheart. Gwendolyn Christie as Longshanks. The Rock as Princess Isabella.

I'd buy the entire world's supply of Amontillado and invite all my new billionaire friends over, one by one, to try some.

Domesticated sand cats.

Full-size Gundam army.

Surplus Delta III ballistic missile submarine, full complement of ICBMs and a Cobra Commander helmet. The world will tremble before my wrath!!!!