...you parry his 6, and he rolls a 1?
...he parries your 5, and you roll a 6?
...you find a pack of lead Aspect Warriors (5 to a box) on clearance for five dollars?
...your Rhino lasts the whole game?
...his asssault cannon jams...
...and yours doesn't?
...his assassin pops up... right near your Techmarine with the Vortex Grenade...
...and he fails his dodge?
...none of your squads get "Jones is acting strangely?"
...you "Reflect" a "Mind War?"
...you hit an exposed vehicle crewman?
...the guy playing Space Wolves at the next table doesn't have any Wolf Guard Terminators with Cyclone Missile Launchers, Storm Shields, and Assault Cannons?
...your commander is better painted than his entire army?
...a Genestealer loses a round of close combat?
...your Adeptus Psyker needs to roll a 6 to fight off a Daemonic Attack, and he makes it?
...his Librarian needs anything but a 1 to fight off the Daemonic Attack, and he doesn't?
...your opponent tries to teleport in a terminator squad to take advantage of that huge gap you left in front of your command group, and he rolls a snake-eyes?
...you finally succeed in hitting your enemy's commander, and he fails his storm shield, D-field, AND armor saves?
...you get the "Saved!" strategy card?
...you're the Space Marines, and he gets the "Virus Outbreak" strategy card?
...he's the Imperial Guard, and YOU get the "Virus Outbreak" strategy card?
...the guy with the Maugetar is actually Maugan-Ra?
...his "Psychic Hood" doesn't do him any good?
...his Tech-Priest with the "Graviton Gun" and "Warp Jump" deviates into base-to-base contact with your Terminator armed with lightning claws?
...you finally succeed in cracking a Carnifex's armor with a lascannon, and roll an 11 for wounds?
... your penal legion frenzies?
... your assassin pops up in a squad of four warp spiders?
... your assault squad engages his ratling snipers in close combat?
... all twenty of your gretchin fire at the same squad?
... your madboyz do something funny?
... your "useless" dreadnought with two power fists gets into close combat with an enemy tank?
... when an Eldar player extends the jump of his 3 warpspiders and he rolls 3 6's. (Really happened. Hell of a roll if you ask me).
... a buzzer squiq swarm kills a Solitare.
... a terminator model gets snake eyes on its armor save roll.
... a barrage actually hit and kill enemy models.
... drawing the vortex power.
... blinding the Hive Tyrant with a Photon Flash Flare.
... a character has "hatred" against the Tyranids.
... misfire / hit rolled for opponents heavy weapons for scatter.
... 1 genestealer out of 10 live to fight and kill the enemy commander in hand to hand.
... that single ork Scarboy who survied the attack from the warp spiders.
... a wraithguard dies and takes another wraithguard into the warp.