Flabbergasted

The place next to ours has been empty and for sale ever since we moved here. They finally have a contract on it (for less than half of what they were asking) and asked Jack to help them get it ready. (No, we're not to the flabbergasted part yet.) The wife asked him to help with something today. He told her that he would be able to after he got done milking. She said, "Milking?! What do you do with the milk?" "We drink it." And to that she replied, "I just go to the store and buy the REAL stuff." (Yep, emphasis mine. And, .... now we're flabbergasted.)
I guess we've had it all wrong. :-0
Nancy