Kristen Kerr was on her way to a hair salon in Reading, Mass., when the elevator taking her to the second-floor salon stalled, trapping her and her 4-year-old daughter, Kaelyn, and infant son, Jackson, inside.
Firefighters soon appeared in the shaft above to rescue the family, but when they lowered a ladder into the elevator, Kaelyn refused to budge.
"When they put the ladder down that's when she kind of started freaking out a little bit," Kristen told MyFox Boston.
Luckily, firefighters John Keough and Scott Myette both had young children and knew exactly the way to bond with Kaelyn – Frozen.
Kaelyn had seen the movie more than a dozen times, a fact which the firefighters used to their advantage: To calm her down, they started singing its show-stopping number, "Let It Go."
"I'm slightly embarrassed to admit this, but yeah, I pretty much knew all of [the words]," Myette told NBC News.
"It's not a bad song, it just gets stuck in your head a bit."
While her mom cracked up at the sight of two burly men singing the delicate ballad, Kaelyn relaxed enough to allow the firefighters to carry her up the ladder. The wait didn't bother her anyway – she even wanted to go back to the salon for her appointment.