At one point late in "The Expendables 2," Sylvester Stallone, Bruce Willis and Arnold Schwarzenegger stand shoulder to shoulder in the same frame, using enormous machine guns to blast away at some bad guys. The sight of the three huge stars in the same movie doing something other than talking (which is all they did in the previous film) should be funny and exciting and nostalgic all at the same time - a kind of wish-fulfillment fantasy for action-movie fans.