The one that kills you....
Anything bigger than 19ft. The thresher's most relatie cousin is the blue shark.
jaws is about a monster shark that has big jaws and always kills people.
An octopus kills a shark by pecking it with large suctiony tenticles. It wraps its tenticles around the shark, inhibiting its movements; it then proceeds to move up and down to pull and push the shark on its beak.
great whites and tiger shark
Mosquitoes are not poisonous but they can spread diseases, some of which can be fatal. People who die from mosquito-spread diseases far outnumber the people killed by shark attacks.
cancer
I belive that the great white is the most popular shark in the sea because most people search about the great white the most.
Cheese eating shark
It is very rare that there have been any shark attacks on people, as you are more likely to get killet by bees than sharks, but the shark that is most likely to attack or eat people is the great white shark.
That thing in the Halo 4 - Camo Kills commercial eats a horn shark. Unfortunately I'm not sure what it is.
Great White