Sean Penn can be an ass sometimes, but he also does good in the world. On 'Larry King Live' (weeknights, 6PM ET on CNN), he talked about the crisis in Haiti.

"This is the apocalypse," said Penn. "Where we are right now is on the verge of what might be the greatest public health crisis in the history of the western hemisphere."

And that will only escalate once the rainy season hits Haiti in a few weeks.

Watch the video after the jump.Sean Penn can be an ass sometimes, but he also does good in the world. On 'Larry King Live' (weeknights, 6PM ET on CNN), he talked about the crisis in Haiti. "This is the apocalypse," said Penn. "Where we are right now is on the verge of what might be the greatest public health crisis in the history of the western hemisphere." And that will only escalate once the rainy season hits Haiti in a few weeks.