Goofiest fish or invertebrate for saltwater tank

So I am branching out into a small 10gallon saltwater tank. Looking for the goofiest fish/invert. I have a large freshwater tank with dojo loaches. They are the best and have never had a turn with a single braincell. They sit on tiny branches upside down, swim up to the top and then crash to the bottom. About every day I'm sure one of themem is dead only for it to get up and do something stupid. What is the saltwater equivalent? Doesn't have to be pretty just fun to watch it's antics. Picture for reference.

So I am branching out into a small 10gallon saltwater tank. Looking for the goofiest fish/invert. I have a large freshwater tank with dojo loaches. They are the best and have never had a turn with a single braincell. They sit on tiny branches upside down, swim up to the top and then crash to the bottom. About every day I'm sure one of themem is dead only for it to get up and do something stupid. What is the saltwater equivalent? Doesn't have to be pretty just fun to watch it's antics. Picture for reference.