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Events in Comics that are not possible. only list examples that fit the description
Red Hulk raised Thor's hammer by jumping into space. Also punching out The Watcher, killing the Grandmaster (who is explicitly immortal) and choking the Silver Surfer (who doesn't need air).
The Guardians of the Green Lantern corps made sure that it would be physically impossible for a lantern to kill one of them. When Hal Jordan kills Krona they are shocked and afraid.
Atrocitus does it without a ring.
Bleez was The Starscreambefore she regains her intelligence. While the other Red Lanterns are growling, "Kill, burn, stab, eat, hate, rage" she was going "Kill... Atrocitus....". In other words, while wearing a ring that turns its host into a mindless berserker, she held onto enough intelligence and focus to choose a specific target.
Simon Baz using his Green Lantern ring to bring his sister's husband out of a coma. B'dg explained that Green Lantern rings cannot cure illness or bring back the dead, but Baz does the former anyway.
Italian comic Sturmtruppen and the Epic Fail of its firing squad tries to execute a prisoner. They managed to miss him and hit the wall behind him while he was holding their rifles pressed directly against his chest.
Breaking Captain America's shield is usually defined as Beyond The Impossible. The few who have done it tend to have "omnipotent" on their resume: Doctor Doom with the power of the Beyonder, the Molecule Man (who described it as weirder than either Thor's hammer or the Silver Surfer's board), Thanos wielding The Infinity Gauntlet, or Thor's big brother, the Serpent. (In the Serpent's case, this was arguably Cheap Heat.)
Ultron apparently did it too in Age of Ultron, though we never see how and it all gets changed by time travel in the end anyway. Considering this was Cap's Shield AFTER it was rebuilt in Fear Itself and further reinforced with magical Uru metal, this REALLY says something...but then again, it's ULTRON.
In the Brightest Day Mera uses her hydrokinetic powers to pull the whole tide away from the shore. Lampshaded by her sister Siren.