4 Razak Al Hassan's arm
The first edition of UFC: Fight for the troops was significant because it helped raise a reported $4 million to support severely wounded veterans and families of those lost in the war. It also had the dubious distinction of witnessing not one, but two gruesome injuries to fighters on the card.
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The last WEC Light Heavyweight Champion Steve Cantwell was booked to face former Marine Brian Stann, but because of an injury to the latter, Razak Al-Hassan stepped in on three weeks notice.
With under a minute remaining in the first round, Cantwell locked in an armbar on Hassan. Despite all the horsepower Cantwell was cranking with, Hassan did not tap, forcing the Brazilian Jiu Jitsu black belt to break his arm. Thankfully, referee Mario Yamasaki waved an end to the fight seeing the broken arm.