I think sharks should be added as a hostile mobs. They would be found in oceans, swiming barely beneath the surface, with only the fin sticking up from the water. If a player in range is under the water, the shark will swim down to him and atack him. It would have 5 harts, and take 3 harts. It would drop 0-3 fish meat, which would be a new item, that gave 4 harts raw and 8 harts cooked. Sharks would be cool, I think, because then the sea would no longer be so safe.
Didn't notch say he would add hostile water mobs? I know he did say he would add whales at one point. Hopefully we will get something similar to sharks.
Too bad you can't right now. Stop using that excuse.
Downloading the mod for sharks that Notch has said will never be added? Yes. Very, very good idea.
1st. This is my first time using that "excuse".
2nd. I was unaware it wasn't updated with 1.4. My fault.