Hello, Mabel (also known as On a Busy Wire) is a 1914 American short silent comedy film directed by Mack Sennett.
Acting
Mabel Normand's reactive genius—she invented the reaction shot.
Production
Telephone exchange set built for maximum physical comedy potential.

Director
Mack Sennett
Trivia, insights & behind the scenes
Telephone operators were one of the few respectable jobs for women in 1914, making Mabel's role quietly radical.
Charley Chase appears as Mabel's boss—he'd later become a silent comedy star himself, proving Sennett's eye for talent.