Suggestion: Went Right Back to Where They Started From

Some stars have a leg-up when auditioning for particular roles, as the character has the same job they had before pursuing acting full-time. Which of these actors gave the most interesting performance under this circumstance? 

Steve Buscemi - Ice cream truck driver 
Clint Eastwood - Military man 
Dennis Farina - Cop 
Ken Jeong - Doctor 
Dwayne Johnson - Pro football player 
James Earl Jones - Military man 
Kal Penn - White House staffer 
Channing Tatum - Stripper/dancer 

List: http://www.imdb.com/list/ls066753294