Steven using a time travel device to make insult comebacks. Sure, he could have used it for more emergency situations but this is a far more frequent and often more satisfying use.
Steven laments that he can't figure out how to summon his weapon, and he says at least he has Cookie Cat. He takes a bite... Cue his gem glowing like crazy, the Gems' shocked responses, and the theme song blasting in the background to reveal...
Pearl: Steven... It's a shield!
When Steven fearlessly stands up to the centipeetle mother saying "LEAVE THEM ALONE!" holding ice cream and ready to kick ass.
When he realizes his powers suddenly no longer work, he uses the smashed freezer to electrocute the centipeetle mother, giving the gems an opening to destroy it.
Garnet: Gems! Weapons! (They summon their weapons.) Let's do it.
"Laser Light Cannon"
Steven activating the light cannon and using its power to destroy the red eye. And the beam the cannon shot formed a shape that looked like Rose Quartz. That whole damn climax was pretty awesome.
Garnet: BRACE YOURSELVES!
When the Gems can't figure out how to get past a magical whirlpool which has gravity several times higher than normal, Steven ropes together some spare sweaters, loops them to the other side, then climbs the wall by himself. Even Pearl, who is extremely concerned for his safety, admits that was cool.
Amethyst (carrying Pearl and Garnet): Steven-style!
Garnet casually knocking down a pillar with ease to make a makeshift bridge.
Steven shoves his demonically-possessed breakfast into a melting pool after it's mutated into a giant monster and taken out the other Gems.
Steven manages to beat the giant worm by tricking it into wrapping itself around the dock, which then collapses from the strain and crushes the worm.
Not to mention summoning the titular bubble, to save Connie from a collapsing chunk of cliff.
Garnet dragging away the nosy Amethyst and Pearl. Not to mention her line: