Shields entered the bout despite the death of his father just three weeks prior.
Ellenberger, widely regarded as one of the most powerful strikers in the UFC welterweight division was hoping to land his heavy hands -- but it was his knees that made the difference.
Not many expected Shields to lose in less than a minute.
Shields hadn't been knocked out in over 10 years. He survived the "H-Bomb" from Dan Henderson but he couldn't handle Ellenberger's power.
"The Juggernaut" blasted Shields with a knee to the body and then an even bigger knee to the face that rocked the recent title challenger.
Shields went down and Ellenberger smelled blood, pounding away with huge left hands on the ground until the referee had seen enough.
The ref certainly made the right call as Shields was so out of it he latched onto the ref's leg hoping to secure a takedown.
Who saw that coming?