In 1977, Conrad Dobler made the cover of Sports Illustrated under the headline, "The Dirtiest Player in the NFL." He scratched, clawed, leg-whipped, stomped and chomped his way to three Pro Bowl trips in the mid-1970s. Yes, "chomped." He once bit the finger of the Minnesota Vikings' Doug Sutherland. One might say Dobler had some retribution coming his way. But nobody deserves to deal with knees ...

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