Justice League of America #5

The cover of this July 1961 issue says it all — Wonder Woman, Green Lantern, the Flash, Martian Manhunter, Green Arrow, and Aquaman are all tumbling helplessly upward like human rockets, with cars and bystanders swept along in the same bewildering chaos. Wonder Woman's exclamation, "An unknown force is pulling us into space — like human rockets!", perfectly sets the stage for the story promised below: "When Gravity Went Wild!" Mike Sekowsky's pencils and Bernard Sachs's inks give the whole scene a wonderfully kinetic energy, capturing Earth's mightiest heroes at their most vulnerable against a threat none of them can punch or outrun.