Ha! I found another reason to hate SAO!
In the orginal OP of season one you can hear a high pitched sound in the left channel during the intro of the song around 11 seconds in. This high pitched sound is actually words, in English, sped up.
When you play it a quarter speed and allow it to be repitched, you can hear what the words are.
>murder me
Enjoy your subliminal messages, ***s.
OP
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Intro of OP played at quarter speed.
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Intro of OP played at quarter speed with lower pitched and higher pitched sounds EQed out.
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Listen carefully somewhere towards the end.
You will hear it.
From like 0:38 or so.
It says it around 0:40.
SAO is demonic and it confirms that only people who worship Satan would actually like this anime.