I used a book to demonstrate how the pile of diapers on their edge would fall over, but a pile of diapers laying flat would stay flat.
Hamish: You used that book to show me that?
Me: I did.
Hamish: That was AMAZING!

Later that day...
[Kyle coughed into his elbow.]
Hamish: Daddy, did you just cough into your elbow?
Kyle: I did.
Hamish: That was AMAZING!