My MacBook Pro is making a weird sound...?

When my laptop is on and I tilt my laptop to the left or right (with the lid open) or if I shake it... it makes a weird sound. When I tilt it towards me, it makes a click sound. When I tilt it to the left/ right it makes a Star Wars' lightsaber sound... haha I know that sounds weird but that's the best description I could think of.

Is this the hard drive moving? I don't think there are any moving parts in the newest generation macbook pro? Should I be concerned... or just let it be?

P.S. I don't "purposely" move my laptop around like this... it's when I'm walking around with my laptop in my hand and I have the lid open and walking to another room, etc.

Thanks for the response!