Tom Coan was all in against Barry Greenstein with the board showing Ks-Jd-6s-3s on the turn. Coan had pocket aces (As-Ah, for the nut-flush draw), while Greenstein held pocket kings (Kc-Kd, for top set). (After the hand, Greenstein admitted that he put the guy on aces, and slow-played him a bit.)
The river card was the 10s, giving Coan the flush to crack Greenstein's set. It was by far the biggest pot of the tournament so far, as Coan now has a little over $250,000 in chips, far more than double whoever is in second place.
Players from other tables quickly gathered in disbelief as word spread that somebody won a pot worth over $200,000. Everyone assumed it was an exaggeration, but once they saw for themselves, they'd return to convince more people that it really happened.
Upon hearing the details, Mike Matusow said, "That's the same thing that happened to me; second hand of the World Series." Matusow had flopped a set of kings, only to lose to a runner-runner flush to pocket aces. (Only in Matusow's case, the money was all-in preflop, whereas here it went in on the turn.)