Leonardo DiCaprio should be lucky he's alive, since he was almost eaten by a shark on the set of the movie Blood Diamond, almost a decade ago. The dangerous situation occurred when he was trapped in a shark tank - with a shark in it!
"They actually said that in 30 years, this has never happened", he said on the Ellen DeGeneres Show. "But the tuna kind of got stuck on the top of the cage, and the great white kind of leapt out and tried to bite it, and it went into the cage with me with half its body was in and out, and I flattened down at the bottom and it chomped a few times", he explained. Leo was luckily not hurt at all.
Source:
http://www.posh24.com/leonardo_dicaprio/leonardo_dicaprio_was_almost_eaten_by_a_shark_on_set