By nature of their profession, NFL linemen are big, tough guys. There are linemen who are literally offensive like Miami Dolphins’ Richie Incognito, who bully and harass others, including fellow linemen.

Then there are big guys who are more good-natured, like Carolina Panthers center Ryan Kalil, who serenaded retiring lineman Jordan Gross with the help of a barbershop quartet during a press conference. 

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