So many great ones it is hard to say. Out of games that I have been to..
-Harold Baines hitting a 3 run walk off HR off of Dan Quisenberry
-Dave Steib having an 8 inning no hitter going and Rudy Law, Bryan Little, and Harold go yard to start the 9th
-The Sox rallying from 8-0 down to beat the Cubs
-Even though we didn't win, game one of the 2000 playoffs, my first playoff game in person
-Jose's walk off HR against the Cubs this year
-Getting a ball and a picture taken with Ron Kittle in 1983, and getting it autographed the next year.
Out of other games
-Robin Ventura's walk off grand slam against Goose Gossage
-Carlos Lee's walk off HR against the Cubs
-Frank's 500 foot HR
-Andy Hawkins no hitter against the Yankees
-The streak against the Yankees and Indians
And I know I am forgetting stuff, but that is a good start.