You know the 'survive for 30 minutes' in the original Terran StarCraft campaign?
One time I went out of my base with craploads of marines and vultures and pwned the whole map, and had nothing to do for the remaining 3 minutes.. I was so proud...
(By the way, any half decent player can easily pull this off, but back then i wasn't that good)
Remember way back in 1.0 the commodore operating the battlecruiser would head off to the bathroom? 'I have to go, Number One.' That gave me a lot of laughs
But the most memorable moment was when, instead of casting defensive matrix on a mostly dead battlecruiser (just as it was so close to safety), I got myself mixed up and yamato'd the Sci vessel instead ! Then the chasing dragoon finished my battlecruiser.