Noel Coward was once asked for a urine sample by the doctor in attendance at the Savoy. "No, no, really out of the question," Coward declared. "Quite impossible." "Just a spoonful," the doctor continued. "I'm sorry," said Coward, showing the doctor to the door. "I haven't got a teaspoon."
Sources
Leonard Rossiter, The Lowest Form of Wit