Mr. Sullivan

A woman goes to the dentist for a toothache and is given gas. On her way home on the subway she can't stop laughing, and every other passenger catches the laughter from her.

A broken-hearted husband thinks about the past as he sits by the fireplace.

Jack and the daughter of a horse trainer are in love with each other, but when the trainer discovers them together, he makes it clear that Jack is unwelcome. Later, at the stables, another suitor for the daughter's hand appears. An unusual agreement is reached, under which the result of a race will determine which of the two the daughter will marry. But Jack's rival proves to be unscrupulous, and he will stop at nothing to be successful.