Maxwell has been a bit under the radar since being acquired from the Astros on July 31, although he made a fine early impression with a pinch-hit, 12th-inning home run to beat the Mets on Aug. 3 at New York.
Grand slams are part of his past, too. His first Major League hit was a pinch-hit grand slam for the Nationals on Sept. 11, 2007, at Florida. He hit a walk-off slam for the Nationals against the Mets on Sept. 30, 2009, the season's last home game at Washington.
"Google it. It's on YouTube. I've watched it a bunch on YouTube," Maxwell said with a grin after his wallop closed the Kauffman Stadium season. "My son has watched it on YouTube, too."
Kauffman's late afternoon shadows, which crossed between the mound and the plate, presented a problem.
"With the shadows there, I was trying to get ready early and I'd never faced Soria before. But I knew, with the shadow there, the ball was going to jump on me, so I was just trying to get ready a little earlier," he said.
The 3-2 pitch landed 421 feet away near the Royals Hall of Fame.
Maxwell revealed a little secret -- he sometimes watches his earlier wallops before games.
"A lot of guys like to watch themselves do well; they call it kind of like a highlight reel before you go out on the field, so you leave the locker room on a positive note," he said. "So you always want to see yourself doing well. So I think that helps a little bit."
Maxwell also told a little story about a bases-loaded situation in April this year with the Astros that didn't turn out very well. He remembered that his 4-year-old son, Jaidon, made his daily request for a home run.
"Right before I got out of the car that day, he says, 'Dad, I want you to hit a grand slam,' and that night, sure enough, I came up with the bases loaded," he said. "I had like a big swing, tried to do too much, the ball was in the box and I tried to hit it and it hit my hand and broke it."
The broken hand put him out for 51 games.
Maxwell has enjoyed the atmosphere since the get-go with the Royals.
"Like how much fun they had in the clubhouse and the dugout, how they kept it loose with what they were playing for," he said. "And I think that's the way to go about it. When you're uptight and nervous all the time, you're not going to do your best. So you try to keep a relaxed clubhouse and a relaxed dugout and try to have some fun."