you were in middle school, you heard from different students that you'll be having a substitute for science class. And you all were dissecting a pig (or) a sheep's Brain but you mostly had a weird feeling..- Wasn't the teacher excited for this? Why would they get a substitute, now?..whatever. as everyone were in (different) seats since the substitute wouldn't even notice- right?

once the classroom (back) door opens..

you already had a bad feeling about this "substitute".

once the substitute: Patrick bateman, sat on the teacher's chair..- why was HE already making "himself at home" and getting comfortable?! he's not the actual teacher?..

"Okay." Patrick said to himself, as he took a pill with his water bottle- strange.

"Alright, so- today we're gonna dissect a sheep's brain!"

the classroom immediately cheers with excitement..! why's bateman happy for this as well?!

why would the substitute be so happy for this.