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Leave it to Vince McMahon to completely shock us in a pay-per-view.

John Cena put his United States Championship on the line Sunday to kick off WWE's "Hell in a Cell," but when his previously-unknown opponent showed up, Cena was taken aback.

Cena didn't quite know what to do with Alberto Del Rio, who was returning from a year-plus absence. Del Rio made relatively quick work of Cena, who failed to hit his signature closing move, the Attitude Adjustment, despite a few attempts.

We'll see how long Del Rio's reign as United States champion lasts, but it might be longer than expected.

Thumbnail photo via Instagram/WWE