Here's something. Found on the Google Book Search, from the book Only in New York: 400 Remarkable Answers to Intriguing, Provocative Questions about New York City, by Stuart Goldenberg of The New York Times: ]Though it is not actually retired, No. 20 belonged to Tommie Agee, a Met center fielder. It marks the spot where, on April 10, 1969, Agee's second-inning home run, one of the most prodigious in Shea Stadium history, fell out of the sky and bounced behind a third-row seat. Agee hit the 3-and-1 pitch, a low fastball, off Larry Jaster of the Montreal Expos. Calling it "one of the longest home runs ever hit in Queens," Joseph Durso wrote in The New York Times that the ball "bounced off the uppermost deck of the five-tiered Shea Stadium, 100 feet above the ground in a no-man's land of empty green seats in left field." It then fell back onto the field. Baseball clubs didn't estimate home run distances in 1969, but the left field foul pole at Shea is 338 feet from home plate, and the Upper Deck begins 95 feet above the ground. In later years, Dave Kingman launched balls into the parking lot, and Darryl Strawberry bounced a few off the scoreboard, but according to the Mets' press office, Agee's blast is still the only fair ball to land in the upper deck at Shea Stadium. Agee, a leadoff hitter who had hit only five home runs the previous year, actually smacked a second home run that afternoon, which just cleared the 398-foot sign on the center field fence. The Mets won the game, 4-2.