Were you at Fenway Park for Games 4 and 5 of the 2004 American League Championship Series, when the Red Sox began to engineer a seemingly impossible comeback?
Were you there when Carlton Fisk waved his arms at his 12th-inning line drive off Pat Darcy, willing it to stay fair to force Game 7 in the 1975 World Series?
How about when Roger Clemens struck out 20 batters on April 29, 1986? Did you see Pedro Martinez's famous takedown of Don Zimmer live and in person, on TV or did you hear about it from a friend? Or do you just need to commiserate with an understanding fan about the Bucky Dent home run in 1978?
Whatever the memory, wherever you saw it take place, the Baseball Memory Lab is a meaningful way to reflect on your own personal history with Fenway Park and the long list of eventful moments that have taken place in the shadow of the Green Monster since it was opened in 1912.
You can start by posting some of your favorite moments at the Baseball Memory Lab, tagging the specific games you attended, players you watched and so on, then share those memories on your social networks.
Major League Baseball Commissioner Bud Selig was the first to do so with a memory of his favorite game from 1957.
Baseball Memory Lab also tracks baseball's development, discovering the ancient roots of the game through historical milestones until about 1870. You can also learn more about the history of the game there by reading the blog of John Thorn, MLB's official historian.
Along those same lines, you can also check out FenwayPark100.com, where you can share your ideas on how to celebrate Fenway's 100th anniversary with the Red Sox.
Adam Berry is a reporter for MLB.com. Follow him on Twitter at @adamdberry. This story was not subject to the approval of Major League Baseball or its clubs.