Rockjaws infinitely jumping back and forth and never landing on your boat nor reacting as you smack them to death.

As can be seen in this video, it's easy to make rockjaws get stuck jumping back and forth while never landing on your boat, allowing you to beat them to death as they jump in and out of the water with no attempt to actually get on your boat at all.

Rockjaws have surprisingly realistic behavior normally, such as them giving up trying to eat you if you put up too much of a struggle to be worth it, and a quirk like this kind of tears right through that feeling, along with making them a non-threat to a player holding a single meat.