[while Alasdair is soaping himself in the bathtub, Mom walks in carrying a bucket]
Mom: Hello, Alasdair.
Alasdair: [suddenly nervous] Mom, what are you doing? I'm taking a bath.
Mom: Well, for Heaven's sakes, Alasdair, I can see that perfectly well.
Alasdair: Mom, a man needs his privacy.
Mom: Alasdair, I saw your privacy the day you were born, dear.
Alasdair: Mom, what do you want?
Mom: Hmmm? Oh, well, you remember the man on the radio was saying how we should all get together and conserve water.
Alasdair: Yes, Mom, I'm only using six inches of water. It's barely enough to cover anything.
Mom: [she looks into the bathtub, lowering her voice] I know.
[while she continues talking about conserving water, Alasdair looks down at himself as he realises what she's referring to]