Bring back megalodon, with our ability to clone sheep i say megalodon should be brought back from fossilized history and its time as a fossil must end. Think about it, we no longer would have to fear great white sharks, whales would be wiped out(who needs those anyway?), fishermen are going to need a bigger boats, Somalian pirates wouldn't dare go out into the ocean on their little dinghies and one megalodon kill could probably feed 10000 people or maybe enough sushi for one steven seagal
as they say, there's always a bigger fish