I went to the science museum in L.A. a couple of weeks ago. They had an infrared light camera. My fingers look gangrenous. I've always said the blood doesn't go into them very often.
One of the temporary exhibits was on human reactions to fear. In one station, they strap you to a padded table and then drop you backwards. They then play your reaction on a video screen for visitors to watch.
Yep, I reacted. I must say, most of the others who went before me were super cool, and just smiled and laughed as they dropped. Reminds me a bit of those photos they take of you on Disney rides. I'd be in a group of 8 or so in a roller coaster photo: the others would all be laughing and I'd be screaming.