A childhood belief about in my closet

Several years ago, my older sis and I decided to make up a story to tell to our younger sister. Our little sis had recently gotten chicken pox and what is now a round scar on the left of her forehead was a chicken pock that was healing at the time; oozing and such. So we told our gullible little sis that her brains were leaking out out of the hole, and that she would have to get a new brain. When she questioned us, we went on to tell her that the same thing had happened to Maw Maw (Dad's mom), and that if we went into the hall closet in her house, we'd find an old brain that had once belonged to Maw Maw... our sis had been almost inclined to believe us before that, but she was too smart to believe that Maw Maw was hoarding an old brain in her closet!