“I write pretty much everything with Jack,” the 23-year-old explained during his June 5 appearance on The Tonight Show Starring Jimmy Fallon. “Jack’s sitting there and he just goes, ‘You know, what if you just did this?’ It looked like he was going to say something really good and then he goes, “Moonbeam ice cream, taking off your blue jeans!”
Stunned by Jack’s idea, Benson noted that he used the lyric “as a placeholder” before he realized how much he liked it.
“We went home and listened to it,” he recalled of the session. “I was like, “Moonbeam ice cream? Hell yeah!”