The very first time they correct a teacher for something other than pronunciation of their own name.
I actually corrected my gifted and talented teacher about his spelling on the chalk board in front of the whole class.
My defining T moment was in Kindergarten. I went to check out Jules Verne books from the library. The librarian told me I couldn't possibly be capable of reading books that level yet. I didn't say anything to her because she was the adult, but I distinctly remember thinking she was ignorant because I had been reading similar level material for a year and a half.
Edit: I'm not a brain or anything. My parents pushed my education earlier than normal.
I was nine, at the wedding of my mother's cousin. I was going through my first animal taxanomy phase, and my mom's cousin worked with primates. She had a lot of other friends that did stuff concerning animals.
I approached four zoologists at a table, told them about monotremes and the giant pangolin. They thought I was making it all up. If I had the damn book where I got it from with me, I would have shown it to them.
Oddly, the situation didn't make me angry. I was at a loss, though.
Go to sleep, iguana.
INTP. Type 1>6>5. sx/sp. Live and let live will just amount to might makes right
Basically always getting into "logical" debates from a very early age whenever I got in trouble. I also picked up languages pretty quickly and would always prefer the company of adults who had something to teach me, or science books about whatever fascinated me at the time.
Ditto. I'll add that there was little discretion used in getting into these logical debates. I had little respect for authority derived from position, which meant that I visited principals' offices from kindergarten through the last year of high school. "But why?", "but that doesn't make sense", and "wouldn't it work better if..." were my anthems. I remember myself as a good kid, but not everybody would agree I also was inseparable from things like encyclopedias, dictionaries, etc. and had no interest in dolls, etc. I had homemade labs before I got into classes where I could play with the real stuff
Ti (43); Ne (41.8); Te (33.7); Fi (30.5); Ni (27.5); Se (24.7); Si (21.5); Fe (17.3)
The More You Know the Less You Need. - Aboriginal Saying
Parent's do not take kindly to their children attempting to make light bulbs, but instead making a (very, very, very weak) rail gun and nearly burning the house down. I have once almost blown myself, my siblings and half my cousins up while demonstrating to them electrolysis. I also once left a bowl full of water and rotting vegitation to see what happened.
Dreams are best served manifest and tangible.
INFP, 6w7, IEI
I accept no responsibility, what so ever, for the fact that I exist; I do, however, accept full responsibility for what I do while I exist.
I invented two languages by the time I was 15. And by languages I mean they were developed to the point of decent communicability. I even developed individual grammatics for each, including writing patterns and explanations for dipthong use.