Daddy Nightmares

The funniest thing happened this morning/last night (sometime in the middle!). I was nursing Sara in our room, and she let out a little cry which must have woken Zack up. He suddenly sat bolt right up in bed with a panicked look and said, "Oh, crud!" He started patting the covers and looking under the sheets. Here's an [almost] exact transcript of what followed:

Lauren: "What's the matter?"
Zack: "Where's the baby?"
Lauren: "I've got her."
Zack: [looking around, still dazed and worried] "Oh"
[Pause while Zack looks around more]
Zack: "So you have the 4-letter Sara?"
Lauren: [laughing] "Yes, Zackie, I've got her."
Zack: "What about the other one?"
Lauren: "What other one?"
[At this point, Zack is starting to get very frustrated that I'm not understanding what he's asking]
Zack: "The... the... doll baby one!"
[Of course, I have no idea what he's talking about, but I play along]
Lauren: "I've got her, Zackie."
Zack: "Where?"
Lauren: "Right here." [walking over to the bed to show him the baby]
Zack: [looking very confused] "But you said... you said you've got the real one."
Lauren: [patting Zack's face to wake him up] "Wake up, Zackie; you're not awake."
Zack: "Ok."