You would think I would have drowned my camera doing something epic like breaking through the ice on a snow machine after shooting IronDog, or in the monster waves of Mavericks, but no. I rented an underwater housing for a vacation in Hawaii and while I wasn't looking, little Daniel took the O-ring from the housing to wear as a necklace.
As I was swimming out to film sea turtles, the camera got heavy and started to sink. Uh oh. I rushed to rinse it out with shower water and put it in rice. Then sent it to Canon to repair.
It turns out that you can save them if you thoroughly rinse with distilled water immediately then something something, don't remember, and overnight to Canon. But I didn't and Canon said it couldn't be saved.