John Cena announces retirement from WWE

Sixteen-time world champion wrestler John Cena announced his retirement Saturday at WWE's Money in the Bank at ScotiaBank Arena in Toronto, which Cena said was the "perfect" place to make the announcement.

In recent years, Cena has shown off a towel that said "Never give up." 

This time, it said, "The last time is now," a reference to his entrance song, "The Time Is Now."

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Cena also wore a shirt that said "The Last Time...