If you mess with this grouper you might lose a fin — and your dinner. A fisherman diving in Jupiter, Florida, speared a fish and was attempting to remove it when he noticed a gigantic grouper headed in his direction.
Once the goliath grouper got within range, it lunged toward the diver and snagged his fin. The fisherman, Arif Sabir, reacted by dropping the fish, which the goliath grouper gladly swooped up. The grouper got a free meal, Sabir got to keep his other fin, and the rest of us are left with this awesome video.