On this one particular day we went it was packed, with long waiting lines at the slides. Since this was shortly after the Jaws movie had been out, and was still playing in theatres, my older brother decided to solve our problem. He pointed briskly out to the deeper part of the river and yelled, "Shaaarrrrrk!!!". Everybody rushed out of the water, with people even climbing over each other to get out. Even though we were on a river in Alabama about 200 miles from the gulf coast.
My family has laughed about that for almost 5 decades. LOL
Funny thing, Bull sharks are found inland 200+ miles, so, yeah, yell, “Shark!”, and you’ll get attention.
Maybe not that funny. Unless you had a dam or two between you and the gulf ... bull sharks have ascended the Mississippi as far as Alton, Illinois, above St. Louis.