Yeah I liked that building suspense as the killer got more enraged when Randy started mocking Billy as a "Momma's boy"
I looked on youtube and saw that many people felt that Billy's mother being chosen as one of the killers was just a rip-off of Friday the 13th.
Hmm, I kinda see their point.
I mean, there was no hint in anything that Billy said that his Mother was psychotic. All he ever said was that she cheated on his father.