doctors, which causes him to resist Albert and Rodney's advice for him to see one, until a medium tricks him into believing his late mother wants him to visit the doctor about his stomach. His fear of doctors goes so far that in the same episode Rodney mentions to Cassandra that Del was once stabbed outside a nightclub by a former fiancée, and rather than seek medical attention he treated the stab wound himself with the help of a bottle of TCP. In "Fatal Extraction", it is revealed that Del is also frightened of dentists, avoiding visiting them whenever possible (his previous dentist died on the night of the Queen's Silver Jubilee in 1977) and only reluctantly visiting due to bad toothache. Del presents himself as being able to speak some French, though few of his phrases make any sense in the context he uses them in (e.g. saying "au revoir" to mean "hello" and "bonjour" as goodbye). He also thinks he has knowledge in subjects like geography (believing Stockholm to be in Norway), history, art and other academic subjects (his lack of knowledge in history is shown well in "To Hull and Back" in which he calls Albert "the finest little sailor this country has produced since Nelson lost the Armada"). He believes the term "yuppie" to be a compliment, and unintentionally causes considerable offence when he calls a person a yuppie to their face. Del Boy is not always honest when expressing his love for his family and others. This side of his nature is shown in numerous episodes, such as "Diamonds Are for Heather", "Strained Relations", "Dates", "The Yellow Peril" and "Little Problems". His care for his grandfather ("Grandad" – Lennard Pearce) is shown in "The Second Time Around", when Grandad confesses to having Trigger phone to tell Del that his fiancée, Pauline Harris, killed her first husband, Bobby Finch, by poisoning him. Another example of this care is shown in "May the Force be With You". Faced with the possibility of Del and Rodney going to prison for handling a stolen microwave, corrupt policeman Roy Slater makes a cryptic comment suggesting that an alone and vulnerable Grandad could fall victim to an attack by some hired thugs. Del, having previously refused to name the thief, makes a deal with Slater to guarantee their release, with immunity from prosecution for doing so. Once he is given immunity