Was Mary-Kay jealous of Vicki?
At the beginning of the movie, Mary-Kay approaches Walter during their lunch break and tries to strike up a conversation, much to her avail. At this point I couldn't exactly determine whether she was interested in him, being nosy, or if she was genuinely trying to be friendly.
Later on, Mary-Kay notices Walter and Vicki together, at which point she appears to become somewhat hostile toward the both of them, particularly when she bluntly warns Vicki in the restroom that he might be "damaged goods".
Was Mary-Kay acting this way because she was truly concerned that Walter could be dangerous, or because she was jealous that he wasn't interested in her?