* Watch [[http://www.youtube.com/watch?v=2IzR_ClTE8Y this video]]. When the actual headbanging starts at 0:45, you're pretty much guaranteed to burst out laughing.
* The very idea of BABYMETAL. Extremely adorable idol music mixed with brutal and heavy-as-fuck, face-melting metal.
* Let's just say a first time listener is going to have at least one MoodWhiplash moment, with the only appropriate response as laughter. Regular fans are used to these moments however, embracing it as a part of their sound.