First year ('06), as soon as we got to S-BFE, we didn't know any better, so we just started pitching our site like we were trying to win an Immunity Idol. It was still hotter than ballzak when we heard the first band come on, and we figured we had at least a 30 min hike into Centeroo. So I quickly chugged two bottles of icy-cold spring water, before we started walking.
Three paces after I finished the second one. I just projectile-puked it. Nuthin but clear, cold water. But the crowds were still amused.
So now we camp a little closer, and pitch tents a bit less urgently. Haven't spewed since.