Giant fish like this grouper are best left alone.
This is especially true when you are in their world while scuba diving.
Wild animals are just that, wild. This is true in the terrestrial and aquatic environments. This young man definitely gets quite a scare from this super-sized fish.
This curious grouper wanted to know what that strange creature was. While checking out this young scuba diver, the diver thinks that it wants to be friends. Petting the fish finally annoys it. Its demeanor changes drastically and it attacks the diver.
When in the wilds, be sure to remember the animals are wild too. Stay hands off of them and they will leave you alone too.