people who's bodies are amazingly, crazily flexible. so if you ever see someone twisted in ways that no human could possibly do successfully, they are most likely contortionists.
At the half-time showyesterday, I saw a contortionist stand on one hand, bend her legs back over her head and shoot a bow-and-arrow accurately. It was mind-boggling.
Someone who sleeps at an awkwardfashion in bed or couch. They bend their neck and upper back greater than 90 degrees. These people do not often use their pillows.
the ultimate sex toy. I don't, however, know if two contortionist's could go at it, because they would probably orgasm before starting just because of the fantasy's.