James Corden and Demi Lovato crashed the dental office of Dr. Jonathan Engel to sing his praises -- literally -- on The Late Late Show.
Dressed in matching gold blazers and yellow bandannas, the late-night host and "Cool for the Summer" singer hit the streets, seeking out ways to celebrate ordinary people with extraordinary achievements.
"It's someone's birthday, someone's been promoted, and we're going to go into their place of work -- they have no idea we're turning up -- and we're going to sing them telegrams," James told ET.
Dr. Engel was being honored for raising money for the YMCA, so it was only right that they sang a remixed version of the Village People's 1978 classic tune of the same name.
As for Corden and Lovato's next adventure, the late-night host says it could be anybody!
"We're sort of making them up on the fly," he said.
The duo certainly surprised Dr. Engel! The dentist had raised $6,000 for the YMCA and had vowed to shave his head bald if he got to $10,000.
Dr. Engel agreed to let Lovato shave his head if they donated the rest of the money. "I don't believe this is happening," the shocked dentist said.
"We might be the first shaving, singing telegram, mobile barbers," Corden quipped. "Am I wrong?"
The Late Late Show With James Corden airs weeknights at 12:37 a.m. ET/PT on CBS.
Lovato isn't the only pop star to join Corden in his singing shenanigans. Check out Justin Bieber participating in Carpool Karaoke.