This picture is in time with the average heart rate. What you’re hearing is the sound of your blood pumping, which you aren’t normally aware of. This picture tricks your mind into making yourself aware of your heart rate, so you hear it.
“I know what you’re thinking. “Angry Black Captain.” It ain’t nothing but a stupid stereotype. Well, guess what, motherfuckers. I’m black. And I worked my ass off to be the Captain! And sometimes I get angry. So suck a dick!”