The Amazing Spider-Man #206 (1980)
“A Method In His Madness!”
Writer: Roger Stern
Artist: John Byrne
Turns out Jonah didn’t actually go crazy at all. It was just a plot by Jonas Harrow (the guy behind Hammerhead, Kangaroo, and Will-o-the-Whisp). He created a ray that could alter your brain waves and make you act crazy, angry, and violent. Spider-Man finds the ray and destroys it, then knocks Harrow out. Jonah goes back to his sane, Spider-Man hating self again.