Scientific research has revealed sharks aren't the killing machines movies like Jaws and Sharknado make them put to be, but you should still keep your limbs inside the boat at all times.
Sharks are unpredictable by nature, and have been known to use their teeth to investigate stuff they come across in the water, like that boat keeping your butt out of the water.
Which is why you should always make sure you have a GoPro camera on hand you when you head into shark infested waters!
-Via Top Fishing Video