Gruden can't sing, What was the biggest takeaway from last night's Hard Knocks? Jon Gruden apparently doesn't know how to sing Happy Birthday.😂 (Via:HBO), By ESPN Houston
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Monday Night Football' dares viewers to turn it off, but we can't.
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This is hilarious 😂 #nfl #football #nflfootball #raiders #jongruden #, Frank Caliendo
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