Hard to say, there's been a lot. If you look at my posting history, you'll see - there's not a lot left of the early days

I posted far more, back then - than I do now.
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The manface thread was pretty far reaching in upsetting a lot of people.
240's meltdown into death threats was fairly epic (though he has redeemed himself over the years - to the point where it is mildly vulgar to bring up his past). I would say at least 50% of this board have no idea that before sarcasm, 240 was trolling the pros massively. Rob sure has changed a lot over the years.
Zach G's pictures for the psyche ward did well
Anything about the mighty Chadwick Mower was a hit
The first incarnation of palumboism was good
The outings of various specimens are high craziness - but they don't really stick in the mind, too much. I guess they are a little too obvious.
The craziest was probably the moment we found out about Titus. No getbig member has achieved such lofty heights, since.