Why is a shark scary?

Sharks have been feared one because of the movie "Jaws," and two because humans were just naturally scared of them.

Well in a way it's pretty obvious their rows and rows of razer sharp blood covered teeth, their beedy eyes, their ability to smell blood and food from hundreds of miles away, their iron frame, most of the time it's impossible to fight one off. Most of the fear is contributed to the fact that you can't fight a shark unless underwater and it's harder to see and move your limbs in that state theres a way to escape if you punch them fiercly on the nose but the fact that its near impossible to escape a shark attack is usually the reason. Jaws is definitely a contributor though, a huge one.