7 y/o: invited a boy from my class to come over after school to play. he said "no, you have chicken pox". I laughed and hand-waved away the fact that I didn't know what kind of food 'chicken pox' was by confidently saying "no I don't, but we can make some other kind of food!"
8 y/o: friend & I would sit in the stairwell of our apartment building, looking out the window at the windows of the building next door, "spying" on people. we only saw shadows, but we made up wild stories about what was going on & recorded them in a notebook labeled "Top Secret"