The lone red seat in the right field bleachers (Section 42, Row 37, Seat 21), signifies the spot where the longest measurable home run ever hit inside Fenway Park's 1934 configuration landed.

Ted Williams hit the home run on June 9, 1946 off Fred Hutchinson of the Detroit Tigers. Williams' bomb was officially measured at 502 feet (153 m)—well beyond "Williamsburg". According to Hit Tracker Online, the ball, if unobstructed, would have flown 520 to 535 feet.

The ball landed on one Joseph A. Boucher, who was supposedly taking a nap at the time, penetrating his large straw hat and hitting him in the head. A confounded Boucher was later quoted as saying,

“ How far away must one sit to be safe in this park? I didn't even get the ball. They say it bounced a dozen rows higher, but after it hit my head, I was no longer interested. I couldn't see the ball. Nobody could. The sun was right in our eyes. All we could do was duck. I'm glad I didn't stand up. ”

Boucher was a Yankees fan, but his business required occasional trips to Boston, where he would often take in Red Sox games. After that hit, Boucher jokingly told reporters that he would take it as a sign from the baseball gods that he should be a Red Sox fan. The next day, the Boston Globe’s sports page headline ran, “Bullseye! Ted Williams Knocks Sense into Yankees Fan.”

No other player at Fenway Park has ever hit the seat since, although on June 23, 2001 Manny Ramírez hit two home runs; one measuring 463 feet and another one that was said to have traveled 501 feet. The 501 foot blast landed somewhere in the MassPike/Railroad cut beyond left field and the official estimate deferred to Williams' record, placing Ramirez's home run exactly one foot short.