This footage is five years old. Maybe you've seen it, but we haven't so we'll wager you haven't. This is Ronda Rousey's first MMA fight in 2010 when she took 23 seconds to beat Hayden Munoz at CFL - Ground Zero.
Kudos to the person who uploaded this video, because their description was prophetic:
"On August 6, 2010 Olympian Ronda Rousey made her MMA debut as an amateur for Combat Fight League's Ground Zero. Her first opponent was Hayden Munoz. Don't blink and make sure to follow this girl. She's for real."
Ronda looks legitimately concerned about her opponent, too. This is her first-ever fight. Gosh she's the best.
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SB Nation presents: How to trash talk Ronda Rousey and not die