David
David goes to a department store and sees a Thermos flask, he asks an assitant how it works.
“It keeps hot things hot, and cold things cold.”
So he buys one. Later on he goes to the training ground, and Mr. Ferguson asks him how his Thermos flask works,
“It keeps hot things hot, and cold things cold.”
“What have you got in it David??”
“Two cups of coffee and a chocolate ice cream.”