Earl

Earl is a large and aggressive truck driver. He enjoys arm-wrestling with patrons of the Truck Stop (such as Clem), just as much as he enjoys country music.

Appearance
Because of his sheer size, his face is never shown throughout his appearance (a theme the animator, Craig McCracken, has been known to employ).

Hamhocks and Armlocks
After Earl challenged Dexter's Dad to an arm-wrestling match for switching his favorite record in the jukebox, Dexter built his father a cybernetic arm, which allowed him to beat Earl in the match and send him flying through the Diner's wall.