In 1840 California, The Texmelucan viscount bizco, offers a feast for his son Tin, who returned from Italy where he studied fencing. The boy turns out to be a coward who flees in terror after refusing to fight a duel with Captain Gaspar. In their flight, Tin rescues a witch was tied to a tree....
An underaged heiress is sent to a reformatory by her unscrupulous guardians to prevent her from fulfilling the conditions of her father's will. Meanwhile, a street-vendor gets mistaken for an eminent psychologist and is hired to teach at that reformatory.
If you survive the first half with his delicious absurdity, your reward is the second half, on the scenes when he teams up with his "carnal" Marcelo singing American, Cuban and Argentinian music, but ending with a very Mexican serenade. If you ever saw Jorge Negrete singing in a movie you'll laugh...