SkullB's Great Adventure/kitchen2

Myth... busted?

You and Casey enter the kitchen. Casey takes a bag of the popcorn and nukes it. After said nuking, she takes it out and eats a piece.

CASEY: Hey! This one's not buttered either!

SKULLB: Curious...

Casey takes another bag and microwaves it. She eats another piece.

CASEY: Holy- no butter!

SKULLB: Curiouser and curiouser...

CASEY: Skully... something's up. If none of these bags have butter in them... what's causing it?

SKULLB: Yeah... it is weird. We need to investigate!

So, where do you start?