Justin Timberlake’s “Can’t Stop the Feeling!” has been a huge hit worldwide since debuting in the summer, but the song was composed for DreamWorks Animation’s Trolls, and occupies a huge emotional point in the film. Timberlake, who also co-stars in the animated pic, not only wrote the song but served as the film’s music executive producer, being instrumental in selecting the songs used at key moments during the story.

The multiple roles put Timberlake in the unusual position of being something of a guinea pig for his own ability to evoke emotions from the film’s audience. He successfully made himself tear up while watching a scene featuring a performance of the Cyndi Lauper classic “True Colors,” as he explained this afternoon while talking with Deadline’s Dominic Patten during the DreamWorks Animation panel at Deadline’s the Contenders event in West Hollywood.

“‘True Colors’ [is] a beautiful song, and it’s a huge emotional moment in the film,” said Timberlake. “And so I’m watching it and I’m like, ‘Am I … crying? At myself?’ I thought my only opportunity to do that was like a bottle of Jack Daniel’s and a mirror!”

The toon from DreamWorks Animation and Fox is on its way to a $40M+ opening weekend. Based on the popular dolls made by Danish woodworker Thomas Dam, Trolls is voiced by an all-star voice cast that also includes Anna Kendrick and Gwen Stefani, as well as The Late Late Show host James Corden, Russell Brand, Jeffrey Tambor, Zooey Deschanel, Christine Baranski and John Cleese. The Trolls soundtrack is produced by Timberlake and features five original songs including one each by him, Kendrick, Stefani and Ariana Grande. The album is No. 33 on the Billboard 200 and tops the Billboard soundtracks chart.