Back in the early 90s, my oldest niece was only a few years old.
While discussing gender with me one day, she told me that she knew a person was a girl if that person had long hair and that she knew a person was a boy if he had short hair.

Her dad, my younger brother, had long hair down past his shoulders.
Her maternal grandmother, her "grammy," had very short hair.

I capitalized.

"So," I said. "Your daddy is a girl and your grammy is a boy." She was so frustrated.

Yeah, I'm the jerk who would mess with the head of an innocent three year old like that. Pray for all who know me.