found out

Iz: Do we have any cardboard? I want to make a sign.

Me: What kind of sign?

Iz: One that says, "Please Don't Park In the Driveway" so Daddy won't drive on the beautiful chalk mural I'm going to draw.

(After obtaining cardboard and pen, we sit on the front step...)

Me: (writing) "P-L-E-A-S-E... Dddd-Oooo-Nnnn-Tttt...  Hmm. "Park." How do you think I'd spell "Park?"

Iz: Pppp P!

Me: Okay. And Aaarrr...Aaarrr...

Iz: ??

Me: A-R...

Iz: A-R!

Me: What would "Park" end with?

Iz: K!

Me: Oh, right - K. Oh, and Isaac, wait til you see -- "Drive" has one of those silent E's!

Iz: Hey! Are you trying to learn me to read??

Me: Wouldn't think of it, kid.