chunk: Jeffrey and Sandy attend Dorothy's nightclub act, in which she sings "Blue Velvet", and leave early so Jeffrey can sneak into her apartment to snoop. He hurriedly hides in a closet when she returns home. However, Dorothy, wielding a knife, discovers him and threatens to kill him. Believing his curiosity is merely sexual and aroused by his voyeurism, Dorothy makes Jeffrey undress at knifepoint and begins to fellate him before their encounter is interrupted by a knock at the door. Dorothy hides Jeffrey in the closet. From there he witnesses the visitor, Frank Booth (Dennis Hopper), inflict his bizarre sexual proclivities—which include inhaling an unidentified gas (possibly amyl nitrite), dry humping, and sadomasochism—upon Dorothy. Frank is an extremely foul-mouthed, violent sociopath whose orgasmic climax is a fit of both pleasure and rage. He continually refers to her as "Mommy" and to himself as both the "Daddy" and the "Baby", who "want to fuck." Frank has kidnapped Dorothy's