Knock, Knock!

Jimmy and Susie have become obsessed with knock knock jokes. I guess we owe our "thanks" to Shelby, Aunt Sommer and Uncle Danny. This summer Shelby learned the joke
"knock, knock
who's there
Shelby
Shelby who?
Shelby coming 'round the mountain when she comes! toot toot!"
So Jimmy started making up his own knock knock jokes, the punchline of which were usually something like "picture carrot" or "car tree"... he really doesn't get the notion of a pun. Well, after our Disney trip, and another week with Shelby, the kids have been on a knock knock kick.
Now Jimmy has a few memorized, such as "Pencil fall down if you don't wear a belt" and "House the weather outside." But Susie's jokes usually go something like this:
"yawk yawk! yawk yawk!" (that's "Susie" for Knock knock)
"who's there?"
"Ummmm... "(looking around)... "House" (or picture or baby)
"House who?
"That house" (pointing to the doll house, or "that baby", "that picture")
"ha ha ha ha ha!"
She is so funny when she says "yawk yawk!"... her eyes go all crazy and she gets so excited that her hair practically stands on end.
Good times, good times!