Ruining Halloween with Rhetoric.

This video has a lot of rhetoric in many different forms.

The narration at the beginning has a very sinister quality to it. This is a result of the speaker's inflection and his word choice. But the main reason the narration is creepy is the creepy music in the background.
All of these aspects combine with the somewhat scary visuals to keep us frightened from the start. This narration has the effect of setting the tone and making anyone watching more likely to be scared later. The narration is very successful in accomplishing this purpose

Then the song starts. It's an awesome song, especially in comparison to the one you posted, Mrs. Cardona.

Again, the creepy effect is caused mainly by the music in the background. The minor key and almost industrial-sounding instrumentation create an unsettling mood. The lyrics are all about the town of Halloween, and all of the scary stuff that goes on there. To top it all off, these lyrics are sung by all kinds of frightening creatures, from ghosts to witches. This is to try to scare the audience, but not too much. It is still meant to be somewhat fun, which is why there is catchy singing music not creepy minimalist instrumental music (such as the theme from the movie "Halloween"). The video is very good in accomplishing this purpose because while it was a little scary in a fun way, the part that stuck with me was the catchiness of the song.

Overall this is a fun scary video, not a scary scary video, which is exactly what it is supposed to be.