Madame diLustro was a friend of Lemony Snicket and is described as a fine cook and excellent detective. She often hosts dinner parties and flies into a rage if one of her guests arrives even five minutes late. Snicket turns his friend into an interrupting plot device in The Reptile Room: right after he informs readers that the Incredibly Deadly Viper bit Sunny Baudelaire, he says that he has to dash off for one of diLustro's dinner parties. She was not included in the film; instead, Snicket's typewriter jams right after Sunny is bitten.
Later, in the book The Grim Grotto, Lemony Snicket describes good opening sentences for a dinner, including "What would drive a man to commit arson?", "Why do so many stories of true love end in tragedy and despair?" and "Madame diLustro, I believe I've discovered your true identity!", phrases that would be able to lead discussions, arguments and accusations, making dinner a lot more fun.