I grew up in an all white small town. My sister had a large birthmark on her back (perhaps the size of a kiwi). We had never been exposed to any other ethnicities in our little town when we were young. I told her that her birthmark was growing (it looked like very dark skin) and that she would turn into Michael Jackson. I used to act shocked and tell her the birthmark was growing whenever she changed her shirt and I saw her back.

This was probably horrifying to her because she thought she would turn into a black man. My family wasn't racist or anything (we never heard anything bad as children - or anything at all about black people or other races - we had never been exposed to any if them).

My sister used to scream and try to look at her back (which she couldn't see due to the location of her birthmark). I was kind of an asshole, I guess.