This joke appears on a lot of the ever-jolly seaside postcards, varying only in how far the mixed up nurse has gotten in the procedure.  Here Quip shows the patient well on his way to escape (possibly because Nurse Duncan is burdened with that awkward pot of boiling water.)  You need this to go with your OTHER mixed-up nurse postcard from England (No No, Nurse Duncan.  I said SLIP off his SPECTACLES).  A Sapphire card, never mailed or messaged