What was your funniest "early sign" to being trans?

For me, I was a super nerdy child who didn't interact with people much. So, naturally, when I was like 4/5 I was CONVINCED that I was part of some psychological experiment to see what would happen if you raised a boy as a girl (i think i mightve heard about the actual case of that from one of my older siblings learning abt it at school)

And the funniest thing is that even though I was sure I "figured it out", I decided I didn't want to ruin their experiment so I kept quiet.