6-year-old: "There is a mosquito near my ear."
Me: "Do you hear it buzzing?"
"Yes. Why does it make that sound?"
"I don't know. Some insects are like that. Noisy at work." ('Like some people', I added to myself.)
"Doesn't it know this sound is going to make someone slam it between their palms and kill it??"
So very profound, that thought. Perhaps he doesn't realise it yet.