Mabel's Busy Day (1914)

Mack Sennett and Keystone pioneered a type of Guerrilla Theater in the years 1911-1915. An event would be taking place, usually near Hollywood. Sennett would grab a bunch of actors and a camera and they would drive to the event. He would shoot the event and have the actors improvise a story around it. Here you have the Queen (Mabel Normand) and King (Charlie Chaplin) of comedy attending an auto race and both improvising slapstick. It is just amazing to watch and pure delight. You can see the crowds in the background rollicking with laughter as they see the future legends performing what would later be called street theater for them and the camera. You might also notice the genuine affection that Charlie and Mabel have for each other, especially in the last scene where they cry together.

This is bliss on film. In the online dictionary, when they give the definition of "happiness," they should show this film.