While playing with a 3-year-old friend of mine, he showed me how his toy dragon's mouth pops off.
"It's not broken. You can fix it. But it doesn't matter, he can fly without his mouth."
As we continued to play, I was a knight the dragon kept attacking. When I told him the dragon couldn't hurt me because he didn't have a mouth to blow fire, my little friend looked me in the eyes, processed what I said and then motioned his dragon toward the knight and whispered a quick "pfff" sound.
"Oh, I see. Is that just small fire because he doesn't have a mouth?"