Some of the medical stuff can do quite odd things to you.
My father in law had quite serious heart surgery some years back and was under anesthesia for quite a long time. Apparently a side effect of the particular one they used is seeing geckos! And duly he did see them. We would be in the hospital visiting him and you would realize that he was staring past you at the wall in fascination. "Is he back again"? usually resulted in an answer of yes. He knew it was not there but he was still seeing it anyway!
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