| Description | The Thing | Why we have it |
| The tiny muscles at the base of your hair follicles contracting. | |
| You do this when you hear a high-pitched sound. | |
| There's one, there's two, there's... Three? On your eye! | |
| Some can do this to their ears. | |
| The useless thing that can get infected in your mouth. | |
| The vestigial organ that looks like a worm. | |