Leonardo DiCaprio

The Hollywood heartthrob has practiced scuba diving for over three decades but his scary shark encounter came as he was making one of his hit movies. In a 2014 interview on 'The Ellen DeGeneres Show', Leo recalled: "We went scuba diving looking for sharks, and I had a huge fear of sharks. And when I did 'Blood Diamond' in 2006, I actually got stuck in a cage with a great white, which was awesome. It was great. It was a gigantic great white, and it was in the cage with me."