"Mr. F" is the fifth episode of season three and forty-fifth episode overall of the TV comedy series Arrested Development.

Michael Bluth sneaks out of work to see a British film, "Love Indubitably," with Rita, his English girlfriend. Afterwards, they come upon a toy store, and Rita tells Michael he should buy a train set for George Michael for his birthday. Michael, however, has already purchased George Michael's big birthday gifts, both of which he wants for the receipt. Although he cannot tear himself away from Rita, Michael feels that he has been neglecting his job. In an effort to compromise, he and Rita go to one of the Bluth Company's development properties, to see if the land is ready to be built on. When Michael and Rita climb up the hill, the ground gives out beneath them, and Michael realizes that he may have a mole problem.

Rita returns home, where she is questioned by the man she is working with, as to why she hadn't been at school that day. He tells Rita that they are there to learn, not fall in love. Rita tells him that she is tired of his orders, and that she can't help falling in love. He shows her a gold star, and reminds her of the oath she had taken. Michael returns home as well, only to find Tobias on the floor. It seems as though getting 4,000 hair plugs in one sitting is beginning to take a toll on Tobias's health. He is also exhausted from the time he has been spending at the gym with his friend, Frank. Frank, played by Jon Viener, is an agent that wants to work with Tobias. Frank actually works for the CIA, but Tobias thinks he works for CAA, a talent agency.

Mister, usually written in its abbreviated form Mr or Mr. (American English), is a commonly used English honorific for men under the rank of knighthood. The title derived from master, as the equivalent female titles, Mrs., Miss, and Ms, all derived from the archaic mistress. The title master was retained and used for boys and young men, but is now less commonly used. The plural form is Misters, or the abbreviation Messrs (UK) or Messrs. (US) ( /ˈmɛsərz/). This is an English abbreviation of the French "messieurs" (French pronunciation: [mesjø]), sometimes pronounced /ˈmɛsərz/ in English.

When addressing someone directly: Mr. is usually used with the last name only ("May I help you, Mr. Thompson?"). In other circumstances, it can be used with either the last name or the full name ("This is Mr. John Smith."; "Would you please help, Mr Smith?"). In formal written address, it is usually used along with the full name, or with initials and surname.

When a man's name is unknown, "mister" is sometimes used informally by itself in direct address, as in, "Hello, mister," or "Are you all right, mister?" rather than the standard form of address, "Sir". Though not necessarily meant disrespectfully, such use may to some people seem rude.