In a YouTube video posted Monday (Aug. 4), a mom, Eva Baker, shows in a 38-second clip how she gets her daughter to stop fussing - by playing her Katy Perry's "Dark Horse."

Be warned that this isn't like countless other videos, where a baby suddenly becomes calm and maybe sings along a bit to the song in question but little else. This baby's shift is from sadness to ABSOLUTE TURNT UP GLEE in the course of about a second.