Why, Why, Why?

It seems that we have officially reached the stage of Adam's life where he asks "Why?" every time we tell him something.

For example:
Mom: "Adam, Mom needs to change your diaper."
Adam: "Why?"
Mom: "Because it is wet."
Adam: "Why?"
Mom: "Because you have drank a lot."
Adam: "Why?"
Mom: "Because you were thirsty."
Adam: "Why?"
Mom: "I don't know."
Adam: "Why?"
Mom: "Because I don't know anything. Go ask your Dad."

I am sure this is just the beginning...