On All In, you send your 130 mind-controlled Mutalisks at Kerrigan's Base
You finish The Devil's Playground before the second lava surge.
On The Moebius Factor, your last Reaper kills the final data core when he only has 1 HP left.
You kill Orlan's base before reaching 6000 minerals.
You've occupied the middle Tal Darim base on Supernova, and your Auto Refineries on the first base are still pumping gas.
You watch your Siege Breakers do their thing on Outbreak.
Your Banshees clear out the 5th base before the Odin even reaches the 4th base.
Beating brutal All In for the first time.
The Tal Darim Executor says "You shall not steal the breath of creation so easily!", Tosh panics, saying "Careful, they're sending their ships to take out your SCVs. Shoot 'em down quick, or we're finished!", and then you click on Jackson's Revenge, who says "Oh, really?"
You mine out all bases, including the gold expansion on In Utter Darkness.
You have Thors and Ghosts on Smash and Grab.
You clear out both Zerg bases on The Evacuation.
You clear out all Dominion bases on The Great Train Robbery.
You have Broodlords on Haven's Fall, The Gates of Hell, or All In.
You drop Siege Tanks in Warfield's base on The Gates of Hell, just far enough so they won't shoot at the Nydus Worms.
The Probes don't even survive long enough to start sealing off the Terrazine Altars.
You take all three broadcast towers on Media Blitz at the same time after clearing out the Dominion bases.
You activate the ARES just before releasing the Hybrid.
On Whispers of Doom, blinking away the Stalker just before the Broodlings hit.
On A Sinister Turn, rescuing the Dark Templar, The Immortal, and the High Templar before the bridge activates and Maar awakens.