Sipping on an Old Style at Wrigley Field is never a bad way to spend a hot Chicago Summer night. This season, with the Cubs comfortably atop the NL Central and careening toward the playoffs, the atmosphere at the park has a particularly intensity.Cub fans recognize this intensity as a familiar mixture of excitement, hope, and inevitable fear that something is bound to go wrong for the boys in Cubbie blue.  Night-after-night fans file into Wrigley, glancing at each other and wondering if the person next to them will be the next Steve Bartman.Despite the nervous nature that is learned at birth for a Cub fan, even the most skeptical of fans could not help but recognize the surge that was sent through the Wrigley Field crowd on Tuesday. As the voice of the public address announcer calmly detailed the terms of a trade that brought Rich Harden to the Cubs, an energy could be felt in the stadium.It was the energy produced by millions of Cub fans simultaneously committing themselves to being either giddy or heartbroken by season’s end. Following the announcement, the first place Cubs have responded, handing the Reds two decisive defeats that seems to acknowledge that there are no more excuses for failure. The team has momentum, talent, and the fans have surrendered their reservations.  With what most Cub fans pointed to as the team’s only weakness fortified, there should be no talk of curses, poor management, or years of inconceivable collapses. If this October does not bring a World Championship to Chicago’s north side, the entire world will know which 25 guys are to blame.