tis the season to be jolly

It's the time of year when we are all loving, giving and merry. The spirit of generosity courses through our veins as we forget the grey meanness of the year behind us and look forward with a sense of well being and fondness for our fellow man. How then did the following conversation come about?

Roz: (happily humming a Christmas ditty while making a pot of tea for us all)
Boss: How many tea bags are you using in that pot?
Roz: Three - why?
Boss: That's far too many. No wonder we get through so many tea bags. Use two in future.
Roz: ...oh...ok.