Watch Blow Your Own Horn Full Movie Free Online 123Movies. World War I veteran Jack Dunbar who, like a lot of veterans then and now, is finding it hard to land a job. When he fixes the broken down auto of the newly rich Nicholas Small, he finally runs into some luck. The blustery Small explains that the way to get ahead is to blow your own horn, and then he takes Dunbar to an estate, where he is introduced as a millionaire.