It wasn't simply a walk-off grand slam. It was an ultimate grand slam, a walk-off grand slam that overcomes a three-run deficit, and those almost never happen. Clemens became just the 34th player in Major League history to hit one, and the first in Twins franchise history. It was only the 15th ultimate grand slam with two outs, making it rarer than a perfect game. For a franchise with plenty of memorable moments, Clemens' ultimate grand slam instantly earned its place among the greatest ever seen in Minneapolis.