i was watching the show "wild boys" on mtv the other day. it's those two idiots from "jackass", steve-o and pontius.
anyway, they were in australia, looking for big sharks. they were towing a foam rubber seal behind a small boat, and a great white was coming completely out of the water to get this thing. pretty impressive.
it's been on quite a bit lately, so check it out if you get a chance.