Former Seattle Mariners' Ken Griffey Jr., left, waves after being introduced by broadcaster Rick Rizzs at a luncheon in his honor at the team's ballpark in Seattle today. The Mariners began a two-day celebration of Griffey on Friday. Griffey is being inducted into the team's Hall of Fame. (AP Photo/Elaine Thompson)

Question: What is the greatest baseball feat that you witnessed Griffey do in person?