On Sunday night, after a tough Game 5 loss to the Houston Astros at Nats Park (one that looks significantly less disappointing from this vantage point), a group of Stoney’s regulars received a surprise that helped cut the bitterness of the events on the field that day.

Pedro Capó, the Puerto Rican artist whose reggaetón hit “Calma” has become the unofficial Nationals celebration song, showed up at the bar on P Street for a nightcap and some food. The musician had just gotten back from spending an afternoon with the team and watching the game at Nats Park. One of the people in Capó’s group brought the singer to Stoney’s, trusting that it would be open late on a Sunday night.

At first, no one really noticed. He sat with a few others at a table near the bar and ordered a round of beers.

“We had seen earlier in the day that [Capó] had been at the stadium, and literally we were singing the ‘Calma’ song all evening because we were so excited,” says Lateef Abney, a Stoney’s regular who lives near the bar and had watched the game there with some friends that night. “My one friend Kelley is such a fan, she was looking up the YouTube karaoke version of the song to try to teach herself Spanish and learn the words.”

That friend, Kelley Halliburton, is a huge Nationals fan who says she listens to “Calma” “approximately 30 times per day.” She was sitting at the bar with Abney and other friends, watching videos of Capó singing the song with Nationals players Brian Dozier and Aníbal Sánchez at the stadium that day. She tells DCist she was getting ready to leave the bar and go home when a friend walked up and told her that the man she was watching on her phone was sitting at a table three feet behind her.

“I said, ‘Hey by the way guys, you guys are watching this on your phone and he’s literally sitting right there behind you,'” says Matt White, a Stoney’s regular who was the first among his friends to realize that Capó was at the bar.

“He was wearing the same shirt [as in the videos,] so it was easy to tell who it was,” Halliburton says. “It was pretty amazing.”

Word spread among the friends at the bar, who eventually decided to buy a round of whiskey shots and approach Capó’s table. “We bought a bunch of shots and went over to him and said, ‘you’re at our bar, so you have take some pictures and shots with us,'” Abney says.

Capó was reportedly more that happy to oblige. He chatted with the group for probably half an hour, Abney says. The singer told the group about his day at the stadium, meeting the Nats staff and players, and what it’s been like to watch the team coalesce around his song.

“We talked for a long time. I got the full debrief of his experience at the Nats game, meeting [Nats manager] Davey Martinez who is also Puerto Rican, dancing in the clubhouse with Dozier and Aníbal Sánchez,” says White. “He was just super over the moon about his reception in D.C. and how ‘Calma’ has just taken off here and become this unofficial anthem for the team.”

Also, White says, “He’s a very handsome man.”

Halliburton got to tell Capó that she was trying to learn the words to his song. “I started trying to learn the words on Thursday or Friday of last week, and I even told him that when I got really excited,” she says. “He thought it was pretty cool.”

Halliburton asked Capó to sign the bill of her hat, and another friend asked him to sing the chorus of “Calma” into his cellphone so he could have it recorded. (He did it.) They all took photos. After about an hour or an hour and a half at the bar, Capó headed out.

“It was pretty amazing. And it was one of those moments like, wow this whole month, this whole ride, and honestly this whole season has been incredible,” Halliburton says. “And it was just another thing like, oh wow, this is really happening. It’s been hard to come up with words.”