Beat my dad, who's really good, at a game of Warhammer. He was running Empire, and I was running High Elves. For those who don't know: Empire has a lot of emphasis on shooting, while HE is more of a jack-of-all-trades things, save them not being so amazing at close combat. We were playing a 1500 point game. On my side, there was a Loremaster of Hoeth (More expensive than a normal mage for a lower bonus to casting and dispel attempts, but they always know the signature spells of the eight lores of magic), a large block of spearmen (Cheap, normal units that have the advantage of being capable of getting an obscene number of attacks), a block of Phoenix Guard (Hardy elite warriors), a block of Sea Guard (Archer/Warrior combo) with a Sea Helm for his Naval Discipline ability (Basically, I can swap from a formation better for shooting to one better for close combat when I'm charged).
On his side, my dad had a cannon, steam tank, halberdiers with a witch hunter and his own level 3 mage, outriders (Cavalry with powerful shooting), mounted pistoleers, and a block of knights with a warrior-priest. My Loremaster didn't actually get a massive number of spells off, seeing as my dad was desperate to prevent him from casting too much, as his Searing Doom spell was really nasty against his knights and steam tank. However, he did manage to get a spell off to take out one of his heroes. I managed to destroy his outriders in my first round of shooting. After a while, my phoenix guard end up fighting off the halberdiers, managing to force them to flee (And eventually off the table). Meanwhile, the pistoleers continue being a general pain in the ass because they're way too fast for me to reasonably catch them. Thankfully, they aren't terribly powerful. I end up miscasting with my Loremaster, taking only a wound, but thankfully catching a few halberdiers in the blast. Knights ram themselves in the side of my Phoenix Guard, but end up getting a block of spearmen in their back. Meanwhile, the steam tank hits the spears' flank too. Somehow, my spearman manage to win combat res versus the tank. It takes a while, since the knights have an insane armor save, but I do eventually mange to take them out. I never do mange to get the pistoleers, but I manged to get the tank down to five wounds remaining (Which is still a LOT, because most things die after one wound, but the tank starts play with ten of them and doesn't take wounds easily).
Counting up the totals, I managed to win by ~500 points, which is just enough to manage a minor victory.
Warhammer Fantasy. I'm really surprised I won, since I'm a) bad at the game, b) rusty, c) playing someone who's really good, d) playing a point limit I'm not used to (We normally play 2500), and e) using an army list I threw together in ~10 minutes.