Lynne is in the bath when George comes in to tell her that they say there could be a drought this year. As George strips off, Lynne is startled and asks what he is doing. George says he is joining her to conserve water. Lynne throws a sponge at him.
George has been listening to the radio in his towel whilst waiting for Lynne to get out of the bath. She has spent far too long in there, so long that the water has turned a vibrant pink.
George is so concerned about the impending drought that he wants to get straight to it and start saving water. He is in such panic that he's likely to use that bathwater to boil his potatoes in later.
What George doesn't know is that Lynne has already planned against the oncoming drought by bathing in two centimetres of water. They are now conserving water twice. The problem is that restrictions on water probably won't come into place until the drought has hit, so what they are doing now, whilst very earth friendly, is essentially pointless.