Hare Trigger.After opening credits underscored by a lively instrumental of "Cheyenne", an old-fashioned train is seen rolling along through the desert. It passes another train going around a utility pole, and voices are heard repeating "Bread and Butter" with the engine blowing its whistle to a tune called "Yankee Doodle". Bugs is riding in the mail car of a train, singing a nonsense song called "Go Get the Axe", when a pint-sized bandit attempts to rob the train (with the underscore playing stereotypical "villain music"), only to have it pass clear over his head. He then calls for his horse, which he needs a rolling step-stair to mount. He catches up and boards the train and begins to rob it while the mail clerk wraps himself in a package marked DON'T OPEN 'TIL XMAS. The bandit accidentally throws Bugs Bunny in his sack. Bugs assumes he's Jesse James. The bandit scoffs and tells him (and the audience), "I'm Yosemite Sam, the meanest, toughest, rip-roarin'-est, Edward Everett Horton-est hombre what ever packed a six-shooter!" (This pattern of Sam introducing himself to Bugs and the audience continued in other cartoons.) Bugs tells Sam that there is another tough guy in the train packing a "seven-shooter", and Sam goes looking for him – and it's Bugs in disguise...