"The Anniversary" is the fifth episode of the second series of BBC sitcom Fawlty Towers.
Basil pretends to have forgotten about Sybil's and his wedding anniversary, having secretly arranged a cocktail party with their friends due to arrive any minute. However, Sybil becomes enraged with Basil as she believes that he has genuinely forgotten and walks out. As the guests arrive, Basil (aided by Polly) goes to extremes to cover up the fact that Sybil has left.
On the morning of their wedding anniversary, Basil acts as though he has forgotten in order to surprise Sybil. He has actually made several arrangements for their anniversary by inviting three couples to a surprise party at the hotel and granting Manuel permission to cook a seafood paella from his mother's famous recipe, something he has wanted to do ever since arriving at Fawlty Towers.
Polly, meanwhile, is complaining to Terry that Basil won't give her an answer about some money she wants to borrow to buy a car. She asks Basil again and he evades her questioning.