One of the things that I love about baseball is the term "ground rule". In any other major team sport, teams play on identically-sized, marked, and measured surfaces. Every baseball park is different, though, so a pop-up down the left field line that would be an out in Cleveland's Jacobs Field might just be a home run in Houston's Minute Maid Park.
Ballpark quirks are part of what gives the game it's character. From Boston's older-than-dirt Fenway Park to San Diego's brand-spanking-new Petco Park, every park is different enough from the next to make the game just a wee bit more interesting.
ESPN.com's Rob Neyer lists four of his favorite ground rules. The list just scratches the surface, as anyone who has ever been to a baseball game at Minneapolis' HHH Metrodome can attest. Play ball, y'all!!