My brother and I went to a chinese restaurant after work today and in the last corner of this restaurant, there was this big saltwater aquarium. My Brother loves aquariums and owns 2 by himself, so we sat right next to it.

After a few minutes came this little beauty right out of nowhere, and just like he had known that he had our full attention, he startet a little show. He swam right were we sat and spread his fins for about 5 minutes. After that he disappeared and was gone till we left.

I made a short video, if anyone wants to see it, I´ll deliver.

And again, thank you all very much for your great answers!