The Amazing Spider-Man #40 (1966)

In The Amazing Spider-Man #40, we see the Green Goblin reveal his true identity to Spider-Man as Norman Osborn - father of Peter's classmate Harry Osborn. As Spider-Man is tied up, the Green Goblin tells Peter about his connection to Professor Stromm and even shares his origin story. It turns out that after an experimental formula explodes in Norman's face, he becomes convinced he can become the greatest costumed criminal of all time. The Green Goblin had chosen to fight Spider-Man because he knew that the underworld would respect anyone who could defeat the hero. But as the Green Goblin prepares to kill Spider-Man, Peter remains defiant and mocks the villain. Meanwhile, Aunt May is worried sick about Peter's whereabouts, and Betty Brant prepares to head back to New York. The Amazing Spider-Man #40 is a classic issue that showcases the intense rivalry between Spider-Man and the Green Goblin, and it's a must-read for any true comic book fan.