When I was 13 or 14 years old, I had to be stay in hospital for a few days because of an injury to the groin, and my father had to stay with me there to look after me. Well, on the second day there, right after waking up from a long nap (like 3 hours) I saw cows right in the hospital room in an illusion. I kept saying to my father "Don't you see the cows? Can't you see them ??" I kept insisting it to him like that for 5-10 mins, then i finally came to my senses and realised there was indeed no cow in the room. Later, my father and I had a good laugh over it and he said that he was scared for a while. :P
