Even though some sharks are more dangerous than others, that doesn't mean meeting the less harmful ones is a picnic. Take, for example, the large and majestic whale shark. These massive beasts are filter feeders like whales and can grow up to 41 feet long. Even though they don't have a natural taste for human flesh, that doesn't mean they won't occasionally scare the crap out of unsuspecting divers.
Need proof? Then I would turn your attention to the terrifying video below from the perspective of a spear fisher in the Atlantic who got a little too close to a whale shark one day.
(source: RM Videos)
I seriously would've peed myself if that happened to me. This combines my two worst fears: the ocean and sharks. I feel bad that this guy just had to live my nightmare.