It was my first year of college and a friend and I participated in a fairly small Starcraft LAN tournament as a team. I had played maybe three multiplayer games of Starcraft at this point, so while I was fairly good I was inexperienced. We got down to the final match, and as a new player I had no idea why everyone groaned when "Blood Bath" was announced as the map, or why everyone else chose the Zerg. I went Protoss, and built a bunch of probes and a few pylons. All this time jeers are coming from the other side of the room as the opposing team brags about how badly they're going to beat us. I was a bit nervous due to the pressure, so I was a bit fidgety, which caused me to control group all of my probes just for the heck of it. Fairly quickly the Zergling rush hit, and a fairly stretched out trail of eight zerglings, four from each opponent, began to trail into my base and head straight for the probes. The probes were very tightly grouped, so I don't think they realized just how many I had built by that point. As the first zergling closed, my probes broke of from mining and spread out. And spread out, and spread out, and spread out some more. The first zergling walked straight into the middle of a circle and exploded after only getting one hit off. The next two came as a pair, and managed to take down the shields of a single probe.
That was when they wised up and actually fell back to form a group with the remaining five. In a more that couldn't have been timed more perfectly if we had planned it, my teammate's slightly slower and larger zergling rush started to hit them, and they focuesed on trying to save their drones. While they were distracted, the probe army snuck up on and annihilated their group of five zerglings,
Over the next five minutes they gradually fought over the center area, my friend having the advantage due to crippling their drones earlier but still outnumbered two to one. It was a constant, desperate struggle of one or two units at a time and frantic reinforcements. Finally, the enemy retook the center with a force of two zerglings and their first hydralisk. They were just getting confident enough to start trash-talking again when I reappeared with a force of 24 zealots.
My favorite part of that story is the rematch afterwards, when our opponents claimed that rushing maps were unfair and we played a Big Game Hunters free-for-all. They teamed up very early on and very obviously, despite being the ones that requested a free-for-all, but took long enough destroying my friend that I was able to set up a very solid Terran turtle base. The crowning glory of that game was when I, not once, not twice, but three times spotted a massive Overlord drop gathering (in the exact same spot each time) and destroyed them utterly with Valkyries.