Maybe I Should Teach Him How to Spell Dynamite

Conversation between Luke and I today:

Luke: How do you spell TNT?
Me: TNT
Luke: No. How do you spell it.
Me: T... N... T
Luke: But how do you spellllll it?
Me: T! N! T!!
Luke: (imagine the loudest, biggest sigh possible and you might get close to the sound I heard)