My Dad came out to visit (his last time away) and had suffered from Parkinson's for 15+ years. He was still mobile, but his cognitive functions were relatively low and his meds also muddled his mind.
One morning he asked me if I knew about the 2 Korean boys who lived in the bathroom. I was caught somewhat off guard by this! And said, "Well, no I didn't know about them". He responded to my surprise by saying (a WWII vet), "Well, don't worry, they're South Korean".
Later in the visit, my purse disappeared. I looked for hours before finding it in the guest bedroom, hidden under something. I asked Dad what it was doing there, and he replied, "I was hiding it from the Koreans". Gads. At one point between those 2 events, he looked me dead in the eye with his previous intellectual intenseness and said, "I don't know if I've mentioned this to you, by the meds cause me to hallucinate". I wish I had thought to ask him if he was cognizant of hallucinating while it was happening or remembered any of it, but I was too busy coping with his changes. My father, unfortunately, suffered greatly at the hands of my mother (she was letting him starve to death) before he was rescued and put in a nursing home. When he died there, one of the caretakers told me that he had always held a special place in their heart for his sweetness and how he had come to them. I am forever grateful.