Required Watching: "Nuts!" (2016)
I know what you're thinking, and are absolutely correct: this is about goat balls. Specifically, about Dr. John R. Brinkley, who in the 1910s developed a cure for impotence by suturing goat testicles into scrotums. He claimed to have done this thousands of times, which is at least partially supported by the fact that he made millions off of it.
...that knowing when to let go of people who have already let go of you is good. Actually letting them go and moving on is better.