The Visible Woman is an exhibit you used to see in museums. It's a life-sized mannequin with transparent skin, so you can see her organs and skeleton. When I was about six, I was into the human body, so when we went to a museum, my dad took me to see this. We went into a small auditorium, where a real life woman stood next to the plastic one. When the chairs filled, we assumed she'd explain to us about the various organs.
Then the real woman walked back stage.
Then the lights went out.
Then the plastic woman's brain began to glow.
"This is my brain," said an eerie, disembodied voice.
That was enough for me. I began to cry. My dad, realizing how creepy this seemed to me, picked me up so we could leave.
AND THE DOOR WAS LOCKED FROM THE OUTSIDE.
This was so that no one would interrupt the presentation, and you exited through a different door. However, dad couldn't figure out how to leave without disturbing everyone, so I spent about ten minutes crouched in the corner, my eyes closed, covering my ears.