The question was asked during the Pinoy Travel Bloggers’ Christmas Party and as of writing my answer would be this picture
This photo was taken inside the Twin Lagoon in Coron, Palawan.
To enter Twin Lagoon you must swim under a small opening where you can pass by only during low tide. During high tide you need to have diving skills just to enter.
How did I came up with the crazy idea? Being a newbie to