Message

Social Behavior:

The serial killer is bad; his alcoholic mother abuses him (sexually and physically) and murders his VIetnam veteran father; Billy's sister is also his daughter; sorority girls make dumb choices, and one by one are killed by demented/evil Billy.

Consumerism:

Drugs/Alcohol/Tobacco:

Billy's mother smokes cigarettes frequently; she's drinking and drunk in almost every scene she's in.

Violence

Repeated stabbings, smothering with plastic bags, splattering blood everywhere; Billy repeatedly pulls out and eats his victims' eyeballs; Billy makes "cookies" of his mother's flesh (with Christmas cutters), then bakes and eats them, with blood everywhere; weapons include knives, a garden hook, ice picks, a sharpened candy cane, a glass unicorn firgure, a barbecue fork, a fireplace poker, a defilibrator, Christmas lights (strangling), and a Christmas tree (impaling); decapitated head rolls out of an opened car door; Christmas tree decorated with eyeballs and decapitated heads.

Sex

Girl who kisses boyfriend is doomed; sorority house mother holds up lingerie she's received as a gift; porn footage on computer screen shows sexual movement (male over female's back), but no explicit body parts; sexual parts named ("ball sac"); reference to sitting on "Santa's lap" serial killer's sexual motivation is discussed; girl in shower seen from back and side (outline of breast, bottom visible) -- as killer's eye watches her. Billy's mother has sex with his stepfather, who falls asleep drunk; she then approaches Billy and drops her robe (viewers see her back and assume she has sex with her son, as his daughter is born nine months later).

Language

Frequent use of "f--k" (30+); repeated use of "s--t" (15-ish); also several uses of "damn."