There have been many movies about sharks, most of these have negative effects.
(The shark above is a great white with a chunk of meat, not human)
Such movies have large sharks with the intent only to eat human flesh. This is far from the truth. Sharks are looking for fish, seals, and turtles to eat. Sharks having bad eyesight might mistake a humans for a seal, turtle or fish and attack. Most times the shark will taste something that is not what it was hunting for, and lucky you, just leave. This is not the case with movies, they just make sharks look bad, and many people get scared of sharks after seeing them.
Video games.
Often video game sharks are hostile, and always attack when you are close by. This does not depend on type/age of the shark, just the fact that it is a shark makes it attack you. In fact many games only have great white sharks and no other kinds. Some only have one shark called shark.
These problems are huge, the world is making movies and games involving sharks and people need to know that these movies are not always telling the truth.