Sherlock Jr. is a 1924 American silent comedy film directed by and starring Buster Keaton and written by Clyde Bruckman, Jean Havez, and Joseph A. Mitchell. It features Kathryn McGuire, Joe Keaton, and Ward Crane.

In 1991, Sherlock Jr. was selected for preservation in the United States National Film Registry by the Library of Congress as being “culturally, historically, or aesthetically significant.” In 2000, the American Film Institute, as part of its AFI 100 Years… series, ranked the film #62 in its list of the funniest films of all time (AFI’s 100 Years… 100 Laughs).

Plot

A movie theater projectionist and janitor is in love with a beautiful loveable girl. However, he has a rival, the “local sheik”. Neither has much money. The projectionist buys a $1 box of chocolates, all he can afford, and changes the price to $4 before giving it and a ring to her. The sheik steals and pawns the girl’s father’s pocket watch for $4.

With the money, he buys a $3 box of chocolates for the girl. When the father notices his watch is missing, the sheik slips the pawn ticket into the projectionist’s pocket unnoticed. The projectionist, studying to be a detective, offers to solve the crime, but when the pawn ticket is found in his pocket, he is banished from the girl’s home.

While showing a film about the theft of a pearl necklace, the projectionist falls asleep and dreams that he enters the movie as a detective, Sherlock Jr. The other actors are replaced by the projectionist’s “real” acquaintances. The dream begins with the theft being committed by the villain with the aid of the butler. The girl’s father calls for the world’s greatest detective, and Sherlock Jr. arrives.

Fearing that they will be caught, the villain and the butler attempt to kill Sherlock through several traps, poison, and an elaborate pool game with an exploding 13 ball. When these fail, the villain and butler try to escape. Sherlock Jr. tracks them down to a warehouse but is outnumbered by the gang to which the villain was selling the necklace. During the confrontation, Sherlock discovers that they have kidnapped the girl. With the help of his assistant, Gillette, Sherlock Jr. manages to save the girl, and after a car chase manages to defeat the gang.

When he awakens, the girl shows up to tell him that she and her father learned the identity of the real thief after she went to the pawn shop to see who actually pawned the pocket watch. As a reconciliation scene happens to be playing on the screen, the projectionist mimics the actor’s romantic behavior.