I just finished reading the book Devil's Teeth by Susan Casey. It's about the Farallon Islands, which are about 40 miles west of San Francisco. They're vicious. The Native Americans thought that was where evil people went to live for all eternity (and all along you thought it was Spokane, Washington!).
Nowadays, the islands are home to tons of seals and, due to this, a population of Great White Sharks that attack anything remotely resembling a seal (i. e. a surfboard). Sharks are so old they predate trees. Can you imagine a time when the world didn't have any trees? Or grass? But some giant fish with three rows of teeth was evolving its scale-y skin?
[Spoiler of the film Deep Water below:]
This woman I used to "work" for showed the film Deep Water on her 50th birthday. That's the film about the couple who was forgotten on a scuba trip and were never found. It's sort of assumed that they were eaten by sharks. Sorry I ruined it for you. It's based on a true story. If you get a kick out of imagining being eaten by large sea creatures, then this is the film for you. And I'm with you on that one.
I do think it's sad that a relatively "young" person (50 ain't old) tried to suggest that it's all over and the sharks are just coming to get you on your 50th birthday. Now, I may be only 27 (god's perfect number), but I do know A LOT of Senior Citizens and fifty seems so adolescent in comparison. I hope that I hit my stride by then and stop getting all pissy around 3:00 every afternoon.