For this experiment you will need two things: a crying baby and a copy of Katy Perry's single "Dark Horse."

Eva Baker uploaded this video of a baby (her daughter?) who isn't enjoying her car ride, then Katy Perry's "Dark Horse" kicks in and the baby instantly goes into "this is my motherfuckin' jam" mode. 

Katy Perry makes babies happy, this is just a scientific fact. 

Berfore: 

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After: 

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