I was in pre-op starting an IV on a healthy 32 year old guy getting a knee replacement. He was in the gurney HOB elevated about 60 degrees. I asked him if he needed me to lay him down and he of course said no, even though he made it clear that he hated needles. As soon as I advanced my needle in the AC he started to say "I dont feel well, I dont feel well". I reasured him and told him to take deep breaths and it would be over in a minute. Then his eyes rolled in the back of his head and he started convulsing and gasping for air. I of course screamed for my charge and he snapped out of it seconds later and said "woah, I had a dream or something". What the heck was that? Does anyone know?