Okay. Here's one from my childhood. My grandfather lost half of the index finger on his right hand in WWII. When I was about 3 or 4, he started telling me that he lost his finger while picking his nose, so I shouldn't pick mine. Obviously, I didn't pick my nose after that. Wanted to keep my fingers as is. When I was 4 I was at the store with my mom and there was a guy there that was missing half of his index finger on the same hand. Apparently, I walked up to him and said "hey, mister. I know that you were picking your nose and lost your finger." My mother was mortified and had to explain the story...

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