Haha I have one of these.

Them: how come most trees are green?

Me: Oh, well the leaves have s…

Them: OK goodbye

I also have another one that likes to hear all the details, and as a young kid they would ask me to explain stuff while they fell asleep.

Me: OK, sleeping time

Them: Can you tell me why we don’t two suns while I lie down?

Me: oh, boy, well… [then I talk until they fall asleep]

I think they were about 3 or 4 when we did this.