Your average dog loves nothing more than a good game of fetch, but it turns out that fish can play too, and seem to really enjoy it. 

That said, the only evidence we have for that statement is the following video where one guy managed to train a fish to swim after and return a bone that he'd thrown into the water, but what more evidence do you need than being able to see it with your own two eyes right here on the dang internet? 

Of course, there are already people claiming that this is fake, but we choose to err on the side of caution and instead advise everyone to be on the lookout for hyper-intelligent, possibly violent fish who want to take over the world.