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Anthony Pettis Superman Punch KOs Stephen Thompson in UFC Fight Night 148 Headliner

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Anthony Pettis knows how to leave jaws ajar.

The former Ultimate Fighting Championship and World Extreme Cagefighting lightweight titleholder moved up to 170 pounds and knocked out Stephen Thompson late in the second round of their UFC Fight Night 148 headliner on Saturday at Bridgestone Arena in Nashville, Tennessee. Thompson (14-4-1, 9-4-1 UFC) bit the dust 4:55 into Round 2, as the South Carolina-based karateka was finished for the first time in his 19-fight career.