NBA (there's so many, but two stick out in my mind)
10/31/84
Celtics vs. Nets
The raising of the 1984 banner. Celts won the game, but the banner was the story.
12/9/84
Celtics vs. Hawks
Celts win 128-127 on a McHale tip in of a Bird miss at the buzzer. Less than a minute earlier, McHale got an elbow to the nose and had broken it. I was sitting near where the teams came out and the high 5 McHale gave me still hurts!
(Pitino's 1st game, last year's playoffs and others, but these two stick in my mind)
MLB (again, so many, four stand out)
10/16/99
Sox vs Yankees
Game 3 ALCS Pedro beats Clemens 13-1
10/2/83
Sox vs Indians
last game of the year. Yaz's last game. An amazing experience, my grandfather's last game.
10/24/04
Sox vs. Cardinals
Schilling pitches, bloody sock and all. Sox win 3-1
10/18/04
Sox vs. Yankees
14 innings, Sox win to send series back to NY
(There are so, so many more, but these are immediate to my mind)
Pro Football
11/13/94
Patriots vs Vikings
Bledsoe lights up second half for a come from behind OT victory, setting NFL marks in attempts and completions
Pro Hockey
4/14/85
Bruins vs Canadians
Bruins win 7-6 in the old Garden, your's truly gets thrown out and then sneaks back into to see the win!
World Cup
7/9/94
Italy vs. Spain
Quarter finals Italy wins 2-1
College Football
11/25/83
Boston Collge vs. Alabama
Sullivan Stadium cold, rainy, snowy, power goes out, BC wins 20 - 13
College Hoops
Nothing really stands out -- lots of games, a few tourneys, but nothing shattering.