Something that occurred to me not too long ago, was the idea of those, rather large, fish with lots of teeth, otherwise known as sharks, barracuda, as well as bluefish! I realise if a Goldfish was so inclined, it could probably injure you, but in reality what is the danger of said fish? I am referring to the Northern Atlantic specifically, home to everything from Great Whites to barracuda, to the infamous "marine piranha"...
I realise that my concerns are probably simply the result of Hollywood and scare-stories, but my idea of fun is not becoming something's dinner...
Cheers