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#2 has to be the TV movie Don’t Go to Sleep
, starring Valerie Harper. The killer pizza-cutter scene is pretty infamous.
#3 might be Bug
(1975). In an effort to preserve prehistoric fire-starting cockroaches that were released by an earthquake, a scientist breeds them with contemporary roaches so the offspring will be better adapted...a mistake, as it turns out.
Hmm... I knew a Dawn Marie once upon a time. Early 1980s, Massachusetts?
Edited by Fred_HYeah, the second one is familiar. The events come back in a series of flashbacks. I think they were leaving the grandmother's house. The dad had had too much to drink to be driving safely . The other kids tied her laces together. I can't remember what guilt the mom had. The only thing I remember about the pizza-cutter scene was going up the stairs and cutting the phone line.
I asked on another forum, and someone there suggested that #1 might be Grotesque.
http://obscurofilms.tumblr.com/post/105255713250/grotesque-1988

Movie 1: Sometime in the mid to late 1990s I caught some of a cheesy B horror movie on the USA network. I'd love to see it again just for the heck of it.
Going by the music and clothing it looks like it would have been made in the late 1980s/early 1990s.
It was about a stereotypical gang of punks led by a white guy with short blonde hair and his black (possibly bi-racial) girlfriend.
The gang ended up in a small town and started harassing a poor disfigured teenager and ended up killing him.
One by one the gang members get killed.
Towards the end of the movie, a police officer or sheriff kidnaps the two gang leaders and takes them to his house to torture them.
The very end of the movie shows this police officer sitting in his easy chair watching tv. You see that he has the same facial disfigurement as the teenager that was killed earlier (the mask that he had been wearing earlier so that he could have a normal appearance is on the table next to him).
Meanwhile there is a cutway to another room in the house, where you see that the two gang leaders have been surgically disfigured by the police officer.
Movie 2: A horror movie; looks like it is from the seventies or early 80s. Mom and dad. Two kids.
They drive somewhere late at night and get in a car accident. Everyone makes it out of the car except for the daughter who couldn't get out because the brother tied her shoelaces together. The car explodes, killing her.
The dead daughter haunts the family and in one scene a pizza cutter starts cutting its way up the staircase. (Sorry that sounds weird but no other way to explain it!)
Movie 3: Another horror movie, probably from the seventies.
A scientist is breeding and creating new species of bugs. Towards the end the bugs keep breeding on their own and getting larger and larger. The scientist is unable to stop this.
The movie ends with I think the scientist's house blowing up.
Edited to add two more movies.
Edited by dawnmarie