Before revealing that he had such a video up his sleeve, Corden asked Mendes about his signature falsetto and how he'd developed the skills hit notes in a higher range. The singer explained that he was "obsessed with falsetto" and had trained with a coach for three years to nail it. Of course, Corden couldn't resist pointing out the challenges of puberty. After joking about it with Mendes, he announced he'd be playing a video showing "Shawn Mendes going through puberty in front of millions."

"I didn't approve this," Mendes said, clearly embarrassed. "I did not approve this."

The non-Mendes-approved video rolled nonetheless, and viewers got to see the singer laugh at himself as it played. Luckily, he only had to sit through about 15 seconds of voice-cracking before the good-natured torture ended.

Watch below.

"The Late Late Show with James Corden" airs weeknights at 12:37 a.m. ET/PT on CBS.