[Spinning] “Mom, guess what I am?”
“Um, a helicopter?”
“No! A helicopter main rotor! I couldn't be a helicopter if I'm only spinning one way. A helicopter has two rotors! That spin different ways! A main rotor and a tail rotor.”
Seriously, I've learned more about vehicles of all kinds (construction vehicles, especially) since this little guy came along than I did in my previous 28 years. He soaks up transportation trivia like a sponge and shares it freely. What a fun kid.