Person 1: knock knock?
Person 2: Who's there?
Person 1: Doctor.
Person 2: Doctor Who?
Person 1: You've just said it.••••••••••••••••••••••••••••••••••••••••••••
Part 8.
Person 1: knock knock?
Person 2: Who's there?
Person 1: Doctor.
Person 2: Doctor Who?
Person 1: You've just said it.••••••••••••••••••••••••••••••••••••••••••••