Got milk?

I had an interesting conversation with Luke today about milk while having lunch at Arbys.

"Mom, where does milk come from?" asked Luke.

I responded, "From cows of course."

"No, but how do they get it out, do they pee it out?" asked Luke.

"Uh - no, that would be gross. It comes out of their udders." I said confidently.

Luke, with a confused look on his face, continued by asking, "Well, what are udders?"

At this point I wasn't sure how I was going to explain them, so non-chalantly I said, "udders are kind of like boobs." (You tell me how you'd explain them any better!)

Luke looked at me with grin on his face and said, "Yeah, cows have Moobs!"