system
Given the following post, respond as if you're commenting on Reddit:
human
[Sharknado] Why do sharknadoes only carry sharks?

If a tornado blasts across the sea and begins pulling sea life up with it, why does it only pick up sharks specifically and not other forms of sea life including kelp, dolphins, tuna, sea lions, squid, small whales, or anything else? Furthermore, how are they able to pick up that many sharks in a relatively small area?
gpt
The storm, as you can guess, isn't natural. It's a psychic storm that manifest when a large number of sharks gather in a small area.
 
No real idea why this happen but the sharks recovered after the storm all appear normal earth types. No enlarged brain or green blood here. Leading theories are (all) sharks are alien and this could be some kind of mating storm. Another being thrown around is it's just a shark party that got out of hand. Sharks don't have police so there's no one to tell them to turn it down. 

Most accepted theory is that north Korea has invented a shark weather machine that can't be controlled. the United nations is currently trying to get access to the country for a inspection.