Do you know what louder means?

THe other night, after putting the 2 older kids to bed, the younger one started yelling for daddy. I went up stairs to see what the problem was. As I got to the top of the stairs, but not around the corner, this is what I heard:

DD: Daaaa-ddyyyyyy!
DS: Yell louder, I don't think he heard you.
DD: Daaaa-ddyyyyyy!
DS: Louder, he can't hear you.
DD: Daaaa-ddyyyyyy!
DS: Do you know what louder means? It means you get noiser than the last time. So yell louder.

I walked around the corner at this point, trying really hard not to laugh at them. Then my DS proceeded to tell me he couldn't sleep because DD was yelling to loud.

At least they keep me entertained :)