#1 Ronda Rousey hits herself in the face (UFC 193, November 14, 2015)
At the UFC 193 weigh in, Ronda Rousey was embarrassed. The then-Bantamweight Champion cut a surly mood throughout, but that was set to worsen considerably.
During the customary staredown, she aimed her fist towards her challenger, Holly Holm's face. Holm responded by going inside Rousey's arm. Rousey used an overhook to try to wrest free, but only succeeded in using Holm's fist to effectively punch herself in the face. Oops!
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Unfortunately for Rousey, the accident proved to be an unwelcome omen of what lay ahead.
Rousey's 12 fight unbeaten streak was unceremoniously snapped by the aggressive Holm, who battered Rousey with leg kicks and punches, to end her Bantamweight title reign in the UFC 193 headliner to become the new champion.
Rousey would fight once more (in another losing effort to Amanda Nunes) before calling it a career.
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