'G.I. Joe' sequel blasts past cavemen to win box office			
  Action movie "G.I. Joe: Retaliation" won the weekend box office battle in the United States and Canada, fighting off 
competition from cartoon cavemen, a Tyler Perry drama, and an alien-possessed heroine trying to save the human race.
"G.I. Joe," a sequel starring Channing Tatum, Dwayne Johnson and Bruce Willis, secured $41.2 million in domestic ticket 
sales from Friday through Sunday, according to studio estimates.
 
Last week's winner, animated prehistoric adventure "The Croods," slip ........
 
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