Inventive and wildly fun, "Nuts!" recounts the mostly-true story of John Romulus Brinkley, a Kansas doctor who in 1917 discovered that he could cure impotence by transplanting goat testicles into men. From there, the story only gets more bizarre. Mixing hand-drawn animated reenactments, interviews, archival footage, and a highly unreliable narrator, "Nuts!" traces Brinkley's rise from poverty and obscurity to the heights of celebrity, wealth, and influence.